The invention relates to compounds of formula:
##STR00001##
wherein R1 is selected from the group consisting of fatty acid acyl groups of 12 to 30 carbon atoms and fatty alcohol groups of 12 to 30 carbon atoms, and wherein R2 is selected from the group consisting of H, fatty acid acyl of 12 to 30 carbon atoms and fatty alcohol groups of 12 to 30 carbon atoms, the same as or different from R1, and the residue of a nutrient, drug, or other bioactive compound, and to the use of these compounds to deliver drugs and other bioactive compounds.
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11. A pharmaceutical composition comprising an effective amount of the compound of 8, 9 or 10 and a suitable diluent or carrier.
wherein R1 is selected from the group consisting of fatty acid acyl groups of 12 to 30 carbon atoms and fatty alcohol groups of 12 to 30 carbon atoms, and wherein R2 is selected from the group consisting of fatty acid acyl groups of 12 to 30 carbon atoms and fatty alcohol groups of 12 to 30 carbon atoms, the same as or different from R1, the fatty acid acyl or alcohol groups R2 being selected from the group consisting of γ-linoleic acid (GLA), dihomo-γ-linolenic acid (DGLA), arachidonic acid (AA), adrenic acid, stearidonic acid (SA), eicosapentaenoic acid (EPA), docosapentaenoic acid n-3, docosahexaenoic acid (DHA), columbinic acid (CA), parinaric acid and conjugated linoleic acid (cLA) groups.
2. The compound according to
3. The A compound according to
wherein R1 is selected from the group consisting of fatty acid acyl groups of 12 to 30 carbon atoms and fatty alcohol groups of 12 to 30 carbon atoms, and wherein R2 is selected from the group consisting of fatty acid acyl groups of 12 to 30 carbon atoms and fatty alcohol groups of 12 to 30 carbon atoms, the same as or different from R1, the fatty acid acyl or alcohol groups R2 being selected from the group consisting of γ-linolenic acid (GLA), dihomo-γ-linolenic acid (DGLA), arachidonic acid (AA), adrenic acid, stearidonic acid (SA), eicosapentaenoic acid (EPA), docosapentaenoic acid n-3, docosahexaenoic acid (DHA), columbinic acid (CA), parinaric acid and conjugated linoleic acid (cLA) groups, and wherein there is a phosphate, or succinate, or other difunctional-acid linking moiety between R1 and the corresponding diol oxygen, between R2 and the corresponding diol oxygen, or both.
4. The compound according to
5. The compound according to
6. The compound according to
7. A pharmaceutical composition comprising an effective amount of the compound of
8. A compound according to
wherein R1 and R2 are pairs of fatty acids selected from the group of pairs of fatty acids consisting of:
γ-linolenic acid and oleic acid; γ-linolenic acid and γ-linolenic acid; eicosapentaenoic acid and eicosapentaenoic acid; γ-linolenic acid and eicosapentaenoic acid; γ-linolenic acid and docosahexaenoic acid; arachidonic acid and docosahexaenoic acid; arachidonic acid and eicosapentaenoic acid; γ-linolenic acid and arachidonic acid; γ-linolenic acid and stearidonic acid; stearidonic acid and docosahexaenoic acid; arachidonic acid and stearidonic acid; dihomo-γ-linolenic acid and dihomo-γ-linolenic acid; dihomo-γ-linolenic acid and γ-linolenic acid; dihomo-γ-linolenic acid and stearidonic acid; dihomo-γ-linolenic acid and arachidonic acid; dihomo-γ-linolenic acid and eicosapentaenoic acid; dihomo-γ-linolenic acid and docosahexaenoic acid; arachidonic acid and arachidonic acid; eicosapentaenoic acid and stearidonic acid; eicosapentaenoic acid and docosahexaenoic acid; docosahexaenoic acid and docosahexaenoic acid; conjugated linoleic acid and conjugated inoleic acid, conjugated linoleic acid and γ-linolenic acid; conjugated linoleic acid and dihomo-γ-linolenic acid; conjugated linoleic acid and arachidonic acid; conjugated hinoleic acid and stearidonic acid; conjugated linoleic acid and eicosapentaenoic acid; conjugated linoleic acid and docosahexaenoic acid; columbinic acid and columbinic acid; columbinic acid and γ-linolenic acid; columbinic acid and dihomo-γ-linolenic acid; columbinic acid and arachidonic acid; columbinic acid and stearidonic acid; columbinic acid and eicosapentaenoic acid; and columbinic acid and docosahexaenoic acid.
0. 12. The compound according to
0. 13. The compound according to
0. 14. The compound according to
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Notice: More than one reissue application has been filed for reissue on U.S. Pat. No. 6,555,700. U.S. application No. 11/405,041 filed Apr. 14, 2006 is a divisional reissue of U.S. application No. 11/119,495 (the present application) filed Apr. 29, 2005 which is a reissue of U.S. application No. 08/945,667 filed Jan. 28, 1998, now U.S. Pat. No. 6,555,700 which is a 371 of PCT/GB96/01053 filed May 1, 1996.
The specification relates to the presentation of bioactives, in which term we include a drug, essential nutrient or any other compound to be administered to the human or animal body in therapy or maintenance of health.
In particular, the specification relates to the presentation of such bioactives in a form in which they are lipophilic so that they can pass lipid barriers in the body readily, or to the presentation of two bioactives in the same molecule (where at least one of the bioactives is a fatty acid or fatty alcohol), or to the presentation of bioactives in a form which serves both aims and/or the aims of ready synthesis of such compounds without a chiral centre. From a drug regulatory viewpoint it is a great advantage to have two bioactives presented as a single molecule rather than as two separate entities. There may also be advantages in presenting known bioactives in novel ways. Those advantages include increased lipophilicity, the additives effects of two bioactives which are not normally presented together, and the sometimes synergistic effects of such bioactives.
The invention concerns the linking of bioactives through certain link molecules, considered in detail later herein, and the synthesis of a range of compounds some of which are entirely novel in themselves, while others are novel in the sense of their usefulness in therapy and/or the maintenance of health. Discussion is however, also given of compounds using other link molecules not currently claimed, and of directly linked bioactives, disclosed for example in EPA-0 393 920 concerning fatty acids and antivirals, and in co-pending EP-95301315.8 (published as EPA-0 675 103) concerning fatty acids and non-steroidal anti-inflammatory drugs.
Concepts such as are discussed above have received no great attention in the published patent and general literature but there is material on certain specific natural diol derivatives and on nutritional and pharmaceutical uses of certain specific diol esters. A source paper in the general literature is Bergelson et al (Biochim. Biophys. Acta 1 16 (1966) 511-520) describing inter alia long chain diesters of 1,3-propane diol. Little is said of the acid moieties but dioleates are identified. In the patent literature edible fat mimetics are for example proposed by Nabisco in EPA-0 405 873 and EPA-0 405 874 and include linolenic acid esters (this term indicating the “alpha” isomer when not qualified otherwise) and arachidonic acid esters of, apparently, 1,4-butane diol. Unilever's U.K. specification 2 161 477 (equivalent to EPA-0 161 114) concerns the growth and economic yield of plants, using inter alia 1,3-propane diol esters of linoleic acid and linolenic acid (again no doubt the alpha isomer). Anti-ulcer drugs of 2,3-butanediol esters are described in SS Pharmaceutical Co's EPA-0 056 189. Sundry pharmaceutical actions of propane-1,3-diol esters of short chain fatty acids are disclosed in Sanofi EPA-0 018 342. More distantly perhaps, Terumo K. K. in EPA-0 222 155 links 5-fluoro uracil to alpha linolenic acid, dihomo gamma linolenic acid, or eicosapentaenoic acid through a group —CH(R)—O— where R=methyl etc as, inter alia, anti-cancer agents.
Many drugs act at the cell membrane surface by combining with cell surface receptors, or alternatively are taken into cells by specific transport systems. However, there are many drugs which, while they act within cells by modifying one of many different functions such as nucleic acid functions, the actions of intracellular enzymes, or the behaviour of systems like the lysosomes or the microtubules, are not able to penetrate cells effectively. There may be no receptors and transport systems with which they can link, or these systems may transport the drug into the cell at a less then optimum rate. Equally drugs may penetrate intracellular membranes such as mitochondrial and nuclear membranes at less than optimum rates.
There are other barriers to drug movements which are recognised as important. One of particular significance is the blood-brain barrier, which has many of the characteristics of the cell membrane. There are many drugs which have difficulty in reaching adequate concentrations in the brain because of this barrier. Another is the skin: until a few years ago drugs were applied to the skin only if their purpose was to act on the skin. However, it has been recognised that the skin can be an appropriate route for getting drugs with systemic actions into the body, and as a result more and more compounds are being administered by variations of patch technology.
All three types of barriers, the cell membrane and intra-cellular membranes, the blood-brain barrier and the skin have an important feature in common, they are substantially composed of lipids. What this means is that they are impermeable to primarily water-soluble drugs unless these drugs can be carried across the membrane by a receptor or transport system. In contrast, lipophilic substances are able to cross the barriers more readily without the need for any specific receptor or transport system.
Drugs whose pharmacokinetic behaviour may be improved by increased lipophilicity, listed by route of entry, are as follows:
For example, the approach discussed is applicable to amino acids. Of particular interest are those which seem to play roles in the regulation of cell function as well as acting as components of proteins. Examples include tryptophan (a precursor of 5-hydroxytryptamine [5-HT], a key regular of nerve and muscle function), phenylalanine (a precursor of catecholamines) and arginine (a regulator of the synthesis of nitric oxide which also plays important roles in controlling cellular activities).
Generally the compounds proposed herein have many advantages in addition to their lipophilicity. Two moieties of a given fatty acid or even a single moiety may be delivered, in a form which is readily incorporated into the body as an oral, parenteral or topical formation; which is very well tolerated with none of the side effects associated, for example, with free fatty acids; which is not too stable to be properly utilised; which need have no chiral centre; and which is much more readily synthesised than the corresponding triglyceride with three moieties of the same fatty acid attached. Whereas triglycerides are well tolerated and well utilised, they are less desirable than the proposed compounds because they are more difficult to synthesise and may have a chiral centre with multiple potential isomers. Moreover with triglycerides the fatty acids may relatively easily migrate from one position to another creating new molecules not present in the original preparation. This obviously causes problems, particularly in the context of drug regulation where such instability may be unacceptable.
When two different fatty acids are to be delivered, the advantages are as before plus the ability to administer simultaneously two materials with different biological actions in a single molecule. This avoids the regulatory problems which ensue when two materials are administered as separate compounds, as well as the issues which arise where there is the possibility of chiral centres. When two drugs are delivered as separate molecules, regulatory authorities normally require each drug to be studied alone as well as in combination. If the two are combined in a single molecule, only the single molecule needs to be studied, greatly reducing the cost of development.
Where actives other than fatty acids are present there are similar advantages. The compounds allow drugs or other compounds to be administered in the form of relatively-lipophilic compounds which are non-chiral (unless the drugs or other compounds are themselves chiral), which release the active moieties relatively easily, and which are well tolerated on oral, topical or parenteral administration. Their lipophilicity enables them to be absorbed partially through the lymphatic system, so by-passing the liver; to cause less gastrointestinal irritation than with many compounds; and to facilitate transport of drugs and other agents across lipophilic barriers such as the skin, the cell membrane and the blood-brain barrier.
There is evidence that interesting specific properties in addition to ready passage of lipid barriers can be conferred on many drugs by making them more lipophilic. These properties include prolonged duration of action, reduction of side effects especially gastrointestinal, bypassing of first-pass liver metabolism and, potentially, site specific delivery of different materials.
The transport of actives across lipid membranes may be improved by linking them directly or via intermediate links to, in particular, gamma-linolenic acid (GLA) or dihomo-gamma-linolenic acid (DGLA), two fatty acids which in themselves have a range of desirable effects. These links also enable bioactive substances to be co-delivered in the same molecule with fatty acids which in themselves have desirable actions, irrespective of any transport advantages. Other fatty acids, such as any of the essential fatty acids (EFAs) and in particular the twelve natural acids of the n-6 and n-3 series EFAs (FIG. 1), can be used. Of these twelve, arachidonic acid, adrenic acid, stearidonic acid, eicosapentaenoic acid and docosahexaenoic acid are of particular interest because they in themselves have particularly desirable effects. Furthermore, any fatty acid, suitably C12-C30 or C16-C30 and desirably with two or more cis or trans carbon-carbon double bonds may also be of use. Use may be in the form of the fatty acid or the corresponding fatty alcohol. Conjugated linoleic and columbinic acids are examples of fatty acids which in themselves have valuable properties and are likely to be of particular use: References to fatty acids are accordingly to be read herein as to both forms, except where the chemistry of one or the other specifically is under discussion. The desirable properties of GLA and DGLA however, make them especially valuable for the purpose.
The essential fatty acids, which in nature are of the all—cis configuration, are systematically named as derivatives of the corresponding octadecanoic, eicosanoic or docosanoic acids, e.g. z,z-octadeca-9,12-dienoic acid or z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoic acid, but numerical designations based on the number of carbon atoms, the number of centres of unsaturation and the number of carbon atoms from the end of the chain to where the unsaturation begins, such as, correspondingly, 18:2n-6 or 22:6n-3 are convenient. Initials, e.g., EPA and shortened forms of the name e.g. eicosapentaenoic acid are used as trivial names in some of the cases.
FIG. 1
n-6 EFA's
n-3 EFA's
18:2n-6
18:3n-3
(Linoleic acid, LA)
(α-Linolenic acid, ALA)
↓
δ-6-desaturase
↓
18:3n-6
18:4n-3
(γ-Linolenic acid, GLA)
(Stearidonic acid, SA)
↓
elongation
↓
20:3n-6
20:4n-3
(Dihomo-γ-linolenic acid,
DGLA)
↓
δ-5-desaturase
↓
20:4n-6
20:5n-6
(Arachidonic acid, AA)
(Eicosapentaenoic acid,
EPA)
↓
elongation
↓
22:4n-6
22:5n-3
(Adrenic acid)
↓
δ-4-desaturase
↓
22:5n-6
22:6n-3
(Docosahexaenoic acid,
DHA)
In their own right GLA and DGLA have been shown to have anti-inflammatory effects, to lower blood pressure, to inhibit platelet aggregation, to lower cholesterol levels, to inhibit cancer cell growth, to reduce dyskinetic movements, to relieve breast pain, to improve calcium absorption and enhance its deposition in bone, to reduce the adverse effects of ionising radiation, to treat various psychiatric disorders, to cause vasodilation, to improve renal function, to treat the complications of diabetes, to dilate blood vessels and so on. Activities linked to GLA and DGLA will therefore not only become more lipophilic, enhancing penetration across all membranes, the skin and the blood brain barrier, but are also likely to exhibit new and additional therapeutic effects. The fatty acid compounds may thus be mutual bipartate prodrugs (if linked directly) or mutual tripartate prodrugs (if connected via a link).
Other fatty acids likely to be of especial value in this context are arachidonic acid and docosahexaenoic acid which are major constituents of all cell membranes; adrenic acid; and stearidonic acid and eicosapentaenoic acid which have ranges of desirable properties similar to those of GLA and DGLA. Fatty acids not included in the fatty acids of FIG. 1 which are of particular interest are conjugated linoleic acid (cLA) and columbinic acid (CA). cLA has a range of interesting effects in treating and preventing cancer, in promoting growth particularly of protein-containing tissues, in preventing and treating cardiovascular disease and as an antioxidant. CA has many of the properties of essential fatty acids.
Kinds of actives to be incorporated in compounds as set out herein may be broadly stated:
The combination of the therapeutic effect of a drug with the therapeutic effect of a fatty acid may be considered through examples:
The essential fatty acids (EFAs) as already referred to, and well known, consist of a series of twelve compounds. Although linoleic acid, the parent compound of the n-6 series, and alpha-linolenic acid, the parent compound of the n-3 series, are the main dietary EFAs, these substances as such have relatively minor roles in the body. In order to be fully useful to the body, the parent compounds must be metabolised to longer chain and more highly unsaturated compounds. In quantitative terms, as judged by their levels in cell membranes and in other lipid reactions dihomogammalinolenic acid (DGLA) and arachidonic acid (AA) are the main EFA metabolites of the n-6 series while eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are the main metabolites of the n-3 series. DGLA, AA, EPA and DHA are important constituents of most of the lipids in the body. As well as being important in themselves they can also give rise to a wide range of oxygenated derivatives, the eicosanoids, including the prostaglandins, leukotrienes and other compounds. The fatty acids likely to be of particular value in therapy are DGLA, AA, EPA and DHA, together with GLA, the precursor of DGLA, stearidonic acid (SA), the precursor of EPA and DPA (22:5n-3), the precursor of DHA, and adrenic acid.
Further there are fatty acids such as oleic acid, parinaric acid and columbinic acid that are not EFAs but may have significant effects in the body. One of the most interesting of these is conjugated linoleic acid which as noted earlier has a range of desirable effects.
It used to be thought that, both in nutrition and in therapy of disease, it was sufficient to supply linoleic and alpha-linolenic acids and the body's own metabolism would do the rest. It is now widely accepted that this is not true. Different diseases may have different abnormal patterns of EFAs and because of problems in metabolism these cannot simply be corrected by giving linoleic or alpha-linolenic acid. It is therefore appropriate in many situations to provide increased amounts of one of the other EFAs or to give two or more of the EFAs simultaneously. While the EFAs can be supplied in various forms and in various mixtures, it is convenient in both nutrition and in medical treatment to be able to supply the fatty acids as particular molecules. Equally in various situations it may be desirable to give the EFA or other fatty acid in association with an amino acid, vitamin, drug or other molecule which in itself has desirable properties.
To date, proposals for administration of two fatty acids simultaneously have been in terms of particular triglycerides, following the natural occurrence of essential fatty acids in triglycerides form. However, triglycerides, unless symmetrical about the 2-carbon, are chiral and that fact, coupled with acyl migration between the alpha and beta positions makes the synthesis of specific triglycerides a difficult task. Such migration may take place after synthesis creating particular problems in a drug regulatory context. The lack of specificity when two fatty acids are present in the same triglyceride molecule creates many problems in synthesis, pharmacology, formulation and stability. Moreover triglycerides can be slow and difficult to synthesise. When treated under similar conditions propane diol derivatives can be made much more rapidly.
For purposes of convenient administration of different fatty acids simultaneously or indeed of a single fatty acid in high amounts in well tolerated form, use is thus desirably made of esters of diols.
The present specification covers fatty acid (or fatty alcohol) derivatives of bioactives with an available carboxyl, alcohol or amino group such that a single, well defined chemical entity is formed. The coupling may be direct yielding bipartate compounds or spaced with an appropriate link group, yielding tripartate compounds, in terms of the number of moieties into which the compounds split.
Among the classes of compounds are those below, where n is conveniently 1 to 3. The substances claimed herein include diesters of class (a) (ii); n=3. Also claimed are phosphate esters of class (b) (iv); n=3. Substances where n is a greater or lesser number, or where the links are not ester links, may be of value for similar reasons and are disclosed but largely not claimed currently.
(a) Bioactives with a free carboxyl group—these may be derivatised as follows:
The individual fatty acids may be purified from natural animal, vegetable or microbial sources or may be chemically synthesized by methods known to those skilled in the art or developed hereafter.
The individual fatty alcohols may be prepared by chemical reduction of the fatty acids outlined above by methods known to those skilled in the art or developed hereafter.
Derivatisation of bioactives in classes (a), (b) and (c) [subclasses (ii) and (iii)] requires the formation of one or more ester bonds. Such chemistry may be achieved by any reasonable method of ester synthesis and especially:
Derivatisation of bioactives in class (c) require the formation of an amide bond. Such chemistry may be achieved by any reasonable method of amide synthesis and especially:
Derivatisation of bioactives in class (b) (iv) requires the formation of phosphate ester bonds. Such chemistry may be achieved by any reasonable method of phosphate ester synthesis and especially:
In general the chemistry of course depends on the nature of the compounds to be linked and on whether links are direct or indirect. Fatty acid pairs may for example be linked directly as fatty acid-fatty alcohol esters or as anhydrides, and if diol linkers are used ether links to fatty alcohols are an alternative to the more generally convenient ester links to fatty acids as such; in all cases linking may again be by chemistry known in itself.
Examples of pairs of actives follow, the resulting compounds listed being, to our knowledge, largely novel. So far as that is so, they represent part of the invention as new chemical entities, as well as being novel in use in treatment or prevention of disease, whether or not currently claimed.
Fatty Acids
GLA-OA (OA=Oleic Acid), GLA-GLA, EPA-EPA, GLA-EPA, GLA-DHA, AA-DHA, AA-EPA, GLA-AA, GLA-SA, SA-DHA, AA-SA, DGLA-DGLA, DGLA-GLA, DGLA-SA, DGLA-AA, DGLA-EPA, DGLA-DHA, AA-AA, EPA-SA, EPA-DHA, DHA-DHA, cLA-cLA, cLA-GLA, cLA-DGLA, cLA-AA, cLA-SA, cLA-EPA, cLA-DHA, CA-CA, CA-GLA, CA-DGLA, CA-AA, CA-SA, CA-EPA, CA-DHA.
Vitamins
GLA-niacin, GLA-retinoic acid, GLA-retinol, GLA-pyridoxal, Di-GLA-pyridoxine, di-EPA-pyridoxal and in general any of e.g. GLA, DGLA, AA, SA, EPA or DHA with any vitamin including ascorbic acid, Vitamin D and its derivatives and analogues, Vitamin E and its derivatives and analogues, Vitamin K and its derivatives and analogues, Vitamin B1 (thiamin), Vitamin B2 (riboflavin), folic acid and related pterins, Vitamin B12, biotin and pantothenic acid.
Amino Acids
GLA-tryptophan, GLA-proline, GLA-arginine, GLA- or DHA-phenylalanine, GLA-GABA, GLA-aminolevulinic acid and in general any of e.g. GLA, DGLA, AA, SA, EPA or DHA with any natural amino acid or related compound such as taurine and carnitine.
Aromatic Acids
GLA-phenylbutyric acid, GLA-phenylacetic acid, GLA-trans-cinnamic acid and in general any of e.g. GLA, DGLA, AA, SA, EPA or DHA with any aryl alkanoic or aryl alkenoic acid.
Steroids
GLA-hydrocortisone, GLA-oestradiol, GLA- and DHA-dehydroepiandrosterone and in general any of e.g. GLA, DGLA, AA, SA, EPA or DHA with any natural or synthetic steroid, such as any oestrogen, any progestin, any adrenal steroid and any anti-inflammatory steroid, particularly betamethasone, prednisone, prednisolone, triamcinolone, budesonide, clobetasol, beclomethasone and other related steroids.
Anti-oxidants
GLA-lipoic acid, DHA-lipoic acid, GLA-tocopherol, di-GLA-3,3′-thiodipropionic acid and in general any of e.g. GLA, DGLA, AA, SA, EPA or DHA with any natural or synthetic anti-oxidant with which they can be chemically linked. These include phenolic anti-oxidants (e.g. eugenol, carnosic acid, caffeic acid, BHT, gallic acid, tocopherols, tocotrienols and flavonoid anti-oxidants (e.g. myricetin, fisetin)), polyenes (e.g. retinoic acid), unsaturated sterols (e.g. Δ5-avenosterol), organosulfur compunds (e.g. allicin), terpenes (e.g. geraniol, abietic acid) and amino acid anti-oxidants (e.g. cysteine, carnosine).
Drugs
GLA and indomethacin, ibuprofen, fluoxetine, ampicillin, penicillin V, sulindac, salicylic acid, metronidazole, fluphenazine, dapsone, tranylcypromine, acetyl carnitine, haloperidol, mepacrine, chloroquine, penicillin, tetracycyline, pravastatin, bisphosphonates such as efidronic acid, pamidronic acid and clordronic acid and their sodium salts, adenosylosuccinate and adenylosuccinate and related compounds and agents used as x-ray contrast media, and in general any of e.g. GLA, DGLA, AA, SA, EPA or DHA with any drug, particularly any drug used in the treatment of infections, inflammatory diseases, including various forms of arthritis, cancer, cardiovascular, respiratory, dermatological, psychiatric, neurological, muscular, renal, gastrointestinal, reproductive and other diseases.
Concepts Applied to NSAIDs; Effectiveness Shown
As a particular example of the concepts discussed, we have prepared derivatives of various non-steroidal anti-inflammatory drugs (NSAIDS) and in particular the GLA-ester of indomethacin. Indomethacin as a non-steroidal anti-inflammatory drug is believed to have a primarily intracellular mechanism of action by inhibiting the enzyme cyclo-oxygenase, which converts arachidonic acid to pro-inflammatory prostaglandin metabolites.
Indomethacin is known to penetrate cells very poorly and so has to be given in relatively large doses which can produce many side effects, thus indomethacin-GLA was compared with indomethacin itself for its ability to penetrate cells, using a normal fibroblast line, a breast cancer line and a malignant melanoma line.
The results are set out in EPA-0 675 103 and show that in all the cell lines the intracellular level of indomethacin after incubation with indomethacin is very low and is mainly detected only in trace amounts. In contrast, again in all cell lines, incubation with indomethacin-GLA resulted in very substantial amounts of both indomethacin-GLA and free indomethacin being found within the cells. These results show unequivocally that the GLA ester of indomethacin penetrates cells effectively and is then deterified intracellularly to provide free indomethacin, and that in view of the many similarities between the cell membrane barrier and the blood-brain and skin barriers, the indomethacin-GLA will also be effective in accelerating the penetration of indomethacin through these barriers. Such penetration, and breakdown to free the actives, is to be expected with all the compounds set out herein.
Aspects of the invention are set out in the claims herein, the main claim referring to compounds, when for use in therapy wherein a 1,3 propane diol residue forms a link between residues R1 and R2 where R1 is an acyl or fatty alcohol group derived from a C12-30 preferably C16-30 fatty acid desirably with two or more cis or trans double bonds, and R2 is hydrogen, or an acyl or fatty alcohol group as R1 the same or different, or any other nutrient, drug or other bioactive residue.
The compounds will generally be acid-function bearing actives esterified directly to the diol residue but for example with a fatty alcohol or other hydroxy-function bearing active, a phosphate, succinate or other difunctional acid group may be interposed between the R1 and/or R2 group and the 1,3-propane diol residue, particularly when R2 is a nutrient, drug or other bioactive with a hydroxy or amino function.
The invention is also discussed broadly below, concerning a wide range of actives releasable in the body.
While direct linkages of bioactives and fatty acids (classes (a)[i], (b)[i] and (c)[i] are discussed above, the present invention concerns primarily class (a)[ii], n=3 whereby bioactives, which may themselves be fatty acids, are linked to fatty acids as diesters of 1,3-propane diol and class (b)(iv), n=3 whereby bioactives, which may themselves be fatty alcohols or 3-hydroxypropyl esters of fatty acids, are linked via a phosphate linkage to a fatty acid monoester of 1,3-propane diol. This diol may also be regarded as 2-deoxyglycerol and the corresponding diesters as 2-deoxy-1,3-diglycerides. Compounds in class (b)(iv), n=3 are also based on 1,3-propane diol and may be regarded as 2-deoxy-2-tysophospholipids. The compounds listed herein are almost all new chemical entities or at least have never previously been used in treatment of human or animal disease.
As a compound the diol used as a link is, broadly, disclosed in the literature among many other diols but we have seen that its use in therapy in the form of an essential fatty acid diester or as a compound with an essential fatty acid at one position and a bioactive (not being an essential fatty acid) at the other, is both undisclosed and particularly significant. Indeed it offers a favourable way to give a single fatty acid as the monoester or diester if a completely defined compound is required, as there is no chiral centre such as is present in glycerol 1(3)-monoesters and in diglycerides (α,β and 1,3 where the fatty acid at position 1 is different from that at position 3), nor do positional isomers exist. Further, apart from administering individual acids, such mono and diesters may have value in pharmaceutical formulation as emulsifiers. The 1,3-propane diol structure is close to the glycerol of natural triglycerides and an effective and safe delivery system. Moreover it allows ready and unequivocal synthesis of defined compounds without the problems of acyl migration shown in triglycerides and without complications by optical isomers. We have for example shown that intravenous infusion and oral administration of a 1,3 propane diol GLA/EPA diester emulsion leads to rapid in vivo release of free GLA and EPA and to further metabolism of the GLA to AA and of the EPA to DHA. Similarly, GLA-GLA and EPA-EPA diesters, and niacin-GLA and indomethacin-GLA diesters have been shown to be absorbed following oral administration and to release their active moieties.
Furthermore, as far as we are aware, all of the 1,3-propane diol derived compounds set out on pages 17, 18 and 19 are novel compounds which have never before been described. The specific diols of fatty acids listed, and the diols where a fatty acid drawn from the list of GLA, DGLA, AA, SA, EPA, DHA, cLA and CA is present at one position and at the other position is a vitamin, amino acid, aromatic acid, steroid, anti-oxidant or other therapeutic drug, are new substances.
The fatty acid diesters have a wide variety of possible uses. They may be used as pharmaceuticals for the treatment or prevention of diseases in which abnormalities of fatty acids have been identified. They may be added to foods or added to or used as nutritional supplements for those who require the particular fatty acid for the treatment or prevention of diseases. They may also be used in foods or pharmaceuticals for veterinary use. They may further be used for skin care.
As advantages or in various particular aspects including those currently in the claims herein, the invention provides:
Examples of specific compounds have been given earlier herein; synthesis examples come later.
Particular uses of particular groups of compounds are indicated elsewhere herein but the usefulness, generally, of the 1,3-propane diol diesters may be illustrated by the following:
The fatty acids have a large number of desirable biological and therapeutic activities which have been detailed in numerous publications by the inventors and by others. Four of the fatty acids, GLA, DGLA, SA and EPA share a rather broad spectrum of effects which include:
These desirable actions mean that this group of fatty acids can be used in the treatment of may different disorders including cardiovascular disorders of many types, inflammatory disorders including rheumatoid arthritis, osteoarthritis, ulcerative colitis and Crohn's disease, respiratory disorders including asthma, psychiatric disorders including schizophrenia, alcoholism, attention deficit disorder, depression and Alzheimer's disease, neurological disorders including multiple sclerosis and Huntington's chorea, renal and urinary tract disorders including various types of renal inflammatory disease and urinary calcium stones, metabolic disorders including osteoporosis and ectopic calcification, and gastrointestinal ulcerative and inflammatory diseases. Although conjugated linoleic acid (cLA) has not been nearly as widely tested as, say GLA or EPA, it also seems to have a wide range of actions including effects valuable in the treatment of cancer, cardiovascular and metabolic diseases.
GLA, DGLA, AA and columbinic acid have desirable actions on the skin and are particularly valuable in the treatment of skin diseases such as atopic eczema, psoriasis, urticaria and allergic reactions.
AA is often regarded as a potentially harmful fatty acid. However, it is an essential constituent of all normal cell membranes and has been found to be present in low levels in various illnesses including atopic eczema, schizophrenia (Horrobin et al, Schizophrenia Res. 1994; 13: 194-207) and cardiovascular disorders (Horrobin, Prostaglandins Leukotr. EFAs 1995; 53: 385-96). AA is likely to be of particular value in these situations and also in other psychiatric disorders such as alcoholism and attention deficit disorder where levels are also often low.
DHA shares some of the above actions of the EFAs but is found in particularly important amounts in cell membranes and especially in the membranes of the heart, the retina and the brain. DHA also has potent anti-inflammatory and desirable cardiovascular effects. DHA is likely to be of particular value in cardiovascular disorders, in retinal and visual disorders including retinitis pigmentosa, senile macular degeneration and dyslexia, and in psychiatric and neurological disorders including schizophrenia, attention deficit disorder, depression, alcoholism, Alzheimer's disease and other forms of dementia and multiple sclerosis.
Infections have also recently been identified as likely to respond to fatty acids, especially to GLA and DGLA, EPA and DHA. Many bacteria are killed by these fatty acids, including strains which are highly resistant to antibiotics. Recent work from a number of laboratories has also shown that these highly unsaturated fatty acids are important in successful responses to diseases like malaria and to protozoal diseases.
It is thus apparent that various specific fatty acids are likely to be able to add to the efficacy of drugs and other bioactive substances of almost any class, in both the treatment and prevention of disease, in skin care and in nutrition, as well as having valuable therapeutic effects when given in the diol form as a single fatty acid or as two different fatty acids in the same molecule. Of particular value in therapy is that under most circumstances the fatty acids are remarkably non-toxic and can be administered safely in large doses without the risk of important side effects.
As a specific example of the therapeutic efficacy of the diesters, the 1,3 GLA-EPA propane diol diester was tested in the treatment of the ASPC-1 human pancreatic -cancer transplanted subcutaneously into nude mice which because they lack thymus function are able to accept foreign transplants without rejection. 15 mice were each injected subcutaneously with 5 million ASPC-1 cells suspended in Matrigel and DMEM buffer. In all animals a tumour developed whose size could be measured using callipers and whose volume could be estimated from the linear dimensions. Tumour size in each animal was measured twice weekly for five weeks. The animals were divided into three groups. 5 animals were used as controls and received 10 g/kg corn oil per day only. 5 animals received 10 g/kg corn oil per day but in addition received two injections per week of a dose of 1.5 g/kg of the GLA-EPA diester. The diester was administered in the form of a 20% emulsion in which 2% of oat galactolipid was used as the emulsifier; the intravenous emulsion was very well tolerated and caused no haemolysis or thrombophlebitis or any other form of distress to the animals. The other 5 animals instead of the corn oil received 10 g/kg/day of the GLA-EPA diester. The treatments were continued for three weeks and then the tumours were allowed to grow for a further two weeks before the animals were sacrificed and the tumours excised and weighed. The mean tumour weights were: control group, 1240±290 mg; intravenous GLA-EPA group, 820±180 mg; oral GLA-EPA group, 490±160 mg. Tumour growth was thus substantially inhibited by both oral and intravenous administration of the GLA-EPA diester without causing any side effects or distress in the animals. This demonstrates that the GLA-EPA diester can be effectively used in the treatment of cancer as would be predicted by the effects of GLA and EPA given separately in being able selectively to kill human cancer cells in culture in the laboratory. Thus the diesters are biologically active ways of administering the various fatty acids. The diesters can therefore be reasonably expected to exert the many desirable effects of the fatty acids which have been noted in many publications in the literature (e.g. Horrobin D F, ed., Omega-6 Essential Fatty Acids: Pathophysiology and Roles in Clinical Medicine: Wiley-Liss, New York, 1990. Simopoulos A P et al, eds, Health Effects of Omega-3 Polyunsaturated Fatty Acids in Seafoods, Karger, Basel, 1991. Fats and Oils in Human Nutrition, World Health Organization, Rome, 1994. Unsaturated Fatty Acids: Nutritional and Physiological Significance. British Nutrition Foundation, Chapman and Hall, London, 1992).
1. 1,3-propane diol as derivatives containing: two fatty acids in which one fatty acid is GLA or DGLA and the other is GLA, DGLA, SA, EPA, DHA, cLA (conjugated linoleic acid) or CA (columbinic acid) for the treatment of:
2. 1,3-propane diol as derivatives containing two fatty acids in which one fatty acid is AA and the other is AA, GLA, DHA, DGLA or EPA for treatment of the disorders as at (1) above and especially (a), (g), (i), (k), (q) and (r).
3. 1,3-propane diol as derivatives containing two fatty acids in which one fatty acid is EPA and the other is EPA or DHA for the treatment of any of the disorders as at (1) above but especially (b), (c), (d), (e), (f), (g), (h), (i), (j), (k), (p), (r) and (s).
4. 1,3-propane diol as derivatives in which one position is occupied by a fatty acid drawn from GLA, DGLA, AA, SA, cLA, EPA or DHA and the other position is occupied by an agent, selected from the following list, whose chemical structure is such that it can be linked to the 1,3-propane diol by one of the linkages described herein:
Synthesis of Trielycerides
The following considers the advantages of use of 1,3-propane diol compared in particular to triglycerides.
Specifically, it is proposed that 1,3-propane diol be used in place of glycerol in the esterification of fatty acids, especially where only one type of fatty acid (e.g. gamma-linolenic acid) is to be attached to the three-carbon chain “backbone”. Although diesters and triglycerides are chemically very similar, the manufacture of di-esters can be carried out under very mild conditions, and in a matter of hours. To manufacture triglycerides, either harsh conditions are required, or fatty acid chlorides must be used, or bio-catalysts (which require reaction times of several days) are necessary.
A summary of triglyceride synthesis methods is: chemical reaction with metals, metal-chlorides, or organic acids as catalyst; use of fatty-acid chlorides; use of immobilised enzymes.
All processes using acids, metals, or metal chlorides as catalysts are very similar and share a common list of advantages and disadvantages. Many of the problems are inherent to the methods, i.e; acidic conditions and high temperatures (140° C. to 180° C.). The p-TSA method probably exhibits the least problems, as this is carried out under the mildest conditions (140° C.). Reaction of glycerol with fatty acid chlorides is done under “cold” conditions, but toxic gases are evolved and the reaction can go out of control if not monitored carefully. This method also suffers from the fact that the fatty acid chlorides themselves must first be manufactured; this additional step reduces the overall efficiency of the process. A particular family of enzymes, the lipases, can be used to catalyse the esterification reaction under very mild conditions (e.g. at 60° C.), and are probably the catalysts of choice when polyunsaturated fatty acids are being used. However, most enzymes interact most effectively with the 1- and 3-positions of glycerol. Addition of fatty acid to the 2-position is slow, and often dependant upon “acyl migration”, i.e. a fatty acid must first be attached to the 1- or 3-position, and then migrate to the 2-position, where it remains attached. Thus, triglyceride synthesis reactions which are catalysed by enzymes can take days to approach completion.
In theory, the same methods can be applied to the esterification of 1,3-propanediol as can be applied to glycerol. However, when it is considered that enzymes catalyse preferentially the addition of fatty acids to the 1- and 3-positions of glycerol, it is clear they should be particularly effective when used to make diesters. This is indeed the case, with reactions being completed in a matter of hours and at temperatures which are even lower (e.g. 45° C. to 60° C.) than those required for triglyceride synthesis. After four hours free fatty acid can be absent, and after eight hours the yield of diester can be in excess of 95%, the balance being monoester.
A further complexity with specific triglyceride syntheses is the presence within glycerol of both primary and secondary hydroxyl groups and a prochiral centre at the central carbon atoms. These problems may be solved by the use of carefully selected protecting groups and by chiral synthesis. However, this results in multistep syntheses with decreasing yield and increasing impurity levels at each step. In contrast, however, 1,3-propane diol possesses only primary hydroxyl groups and no prochiral centres. The synthesis is consequently reduced to two steps maximum with improved overall yield and decreased impurity levels.
In summary, the reaction which prepares diesters from polyunsaturated fatty acids and 1,3-propane diol is faster, and can be carried out under much milder conditions, than can the corresponding triglyceride synthesis. This leads to a more economical and less wasteful production process and minimises the risk of reactants or products becoming altered or degraded during processing.
The compounds may be formulated in any way appropriate and which is known to those skilled in the art of preparing pharmaceuticals, skin care products or foods. They may be administered orally, enterally, topically, parenterally (subcutaneously, intramuscularly, intravenously), rectally, vaginally or by any other appropriate route.
Like triglycerides, the 1,3-propane diol diesters, especially those containing two fatty acids, may be readily emulsified using phospholipid or particularly galactolipid emulsifiers. Such emulsions are particularly useful for administration via oral, enteral and intravenous routes.
For example, fatty acid (UFA) diesters occur as free flowing oils and therefore can be formulated as follows:
1. Preparation of 20% Emulsion of Diester of GLA and EPA with 1,3-Propane Diol
Oral emulsions were prepared by high-pressure homogenisation. The particle size distributions and the zeta potential of the resulting emulsions were determined by dynamic light scattering at room temperature. The particle size measurements were carried out at room temperature (Zetasizer 4 Malvern Instruments Limited).
An oil-in-water emulsion (batch size 200 g) was prepared containing the following ingredients:
Ingredients
%
Emulsifier (Galactolipid)*
2.00
Diester (GLA-EPA)
20.00
Ascorbyl Palmitate (AP)
0.02
Vitamin E
0.5
Water
100.00
The emulsifier-galactolipid was dispersed in the diester and Vitamin E, AP and water were mixed. The oil phase was added to the aqueous phase under a high shear mix (Ultraturrax) at speed 4, for a few minutes. This pre-emulsion was then homogenised at 80 MPA and at 50° C. for 6 cycles (mini-Lab 8.30 H; APV Rannie AS, Denmark). The emulsion formed has an average droplet size of 230 nm.
Anti-microbial preservatives—potassium sorbate, and flavour, can also be added to the above oral emulsion.
2. Preparation of Intravenous 20% Emulsion of Diester of GLA and EPA with 1,3-Propane Diol
In a similar manner, 200 g of an oil-in-water emulsion was prepared containing the following ingredients:
Ingredients
%
Emulsifier
2.0
Diester (GLA-EPA)
20.0
Glycerol
2.0
Water add to
100.00
The above emulsion, homogenised for 6 minutes in a high pressure homogeniser had an average droplet size of 211 nm, a zeta potential of −40 mV. These I.V. emulsions can be either filtered through a membrane with a pore size of 0.22 microns or can be autoclaved with change in droplet size.
The doses of the actives to be administered largely range from 1 mg to 200 g per day, preferably 10 mg to 10 g and very preferably 10 mg to 3 g, according to their kind. In the treatment of cancer preferable doses may be in the 2-150 g/day range. They may be administered topically where appropriate in preparations where the actives form from 0.001% to 50% of the topical preparation, preferably 0.05% to 20% and very preferably 0.1% to 10%.
Illustrative syntheses of NSAID's linked to fatty acids are given in published EPA-0 675 103 referred to earlier. Illustrative syntheses of the linking of fatty acids, through 1,3-propane diol residues follow, with other generally illustrative material.
1,3-(di-z,z,z-Octadeca-6,9,12-trienoyloxy)propane
(Diester of GLA with 1,3-Propane Diol)
A solution of 1,3-dicyclohexylcarbodiimide (1.07 g) and 4-(N,N-dimethylamino)pyridine (0.59 g) in methylene chloride (5 ml) was added to a solution of 1,3-dihydroxypropane (0.152 ml) and z,z,z-octadeca-6,9,12-trienoic acid (95%, 1.36 g) in methylene chloride (15 ml). The reaction was stirred at room temperature under nitrogen until it was complete as determined by tlc. Hexane (80 ml) was added to the reaction. The precipitate was removed by filtration and washed thoroughly with hexane. The combined filtrates were concentrated and purified by flash chromatography to yield 1,3-(di-z,z,z-octadeca-6,9,12-trienoyloxy)propane as a pale yellow free flowing oil.
(Diester of GLA and Oleic Acid with 1,3-Propane Diol).
Part 1:
A solution of z,z,z-octadeca-6,9,12-trienoic acid (150 g) in methylene chloride (500 ml) was added dropwise to a mixture of 1,3-dihydroxypropane (205 g), 1,3-dicyclohexylcarbodiimide (130 g) and 4-(N,N-dimethylamino)pyridine (87 g) in methylene chloride (2500 ml) at room temperature under nitrogen. When tlc indicated that the reaction had gone to completion the reaction mixture was filtered. The filtrate was washed with dilute hydrochloric acid, water and saturated sodium chloride solution. The solution was dried, concentrated and purified by dry column chromatography to yield 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane as a pale yellow oil.
Part 2:
A solution of 1,3-dicyclohexylcarbodiimide (23.7 g) and 4-(N,N-dimethylamino)pyridine (15.9 g) in methylene chloride (200 ml) was added to a solution of 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (33.6 g) and z-octadeca-9-enoic acid (30 g) in methylene chloride (400 ml) under nitrogen at room temperature. On completion of reaction as evidenced by tic analysis the solution was diluted with hexane, filtered, concentrated and purified by dry column chromatography to yield 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(z-octadeca-9-enoyloxy)propane as a free flowing pale yellow oil.
(Diester of GLA and EPA with 1,3-Propane Diol).
Prepared as in Example 2, Part 2 but replacing z-octadeca-9-enoic acid with z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoic acid. Chromatography yielded 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoyloxy)propane as a pale yellow oil.
(Diester of GLA with 1,3-Propane Diol).
Prepared as in Example 2, Part 2 but replacing z-octadeca-9-enoic acid with z,z,z-octadeca-6,9,12-trienoic acid. Chromatography yielded 1,3-(di-z,z,z-octadeca-6,9,12-trienoyloxy)propane as a pale yellow oil.
(Diester of Lipoic Acid and GLA with 1,3-Propane Diol)
A mixture of 1,3-dicyclohexylcarbodiimide (720 mg, 3.45 mmol) and 4-(N,N-dimethylamino)pyridine (480 mg, 3.98 mmol) in tert-butyl methyl ester (15 ml) was added to a mixture of lipoic acid (645 mg, 3.12 mmol) and 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (1 g, 3 mmol) in tert-butyl methyl ether (30 ml). The mixture was stirred at room temperature under nitrogen for 5 h, the progress of reaction being monitored by tic (40% ethyl acetate/hexane). On completion the mixture was filtered, concentrated and purified by flash chromatography (hexane, 2% ethyl acetate/hexane, 5% ethyl acetate/hexane and finally 10% ethyl acetate/hexane) to yield (±)-1-(1,2-dithiolane-3-pentanoyloxy)-3-(z,z,z-octadeca-6,9,12-trienoyloxy)propane as a viscous yellow oil.
(Diester of Sulindac and GLA with 1,3-Propane Diol)
A solution of 1,3-dicyclohexylcarbodiimide (720 mg, 3.45 mmol) in tert butyl methyl ether (30 ml) was added to a mixture of sulindac (1.12 g, 3.15 mmol), 4-(N,N-dimethylamino)pyridine (480 mg, 3.9 mmol) and 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (1 g, 3 mmol) in tert-butyl methyl ether (15 ml). The mixture was stirred at room temperature under nitrogen for 5 h, the progress of reaction being monitored by tlc (40% ethyl acetate/hexane). On completion the mixture was filtered, concentrated and purified by flash chromatography (40% ethyl acetate/hexane, then 50% ethyl acetate/hexane and finally 60% ethyl acetate/hexane) to yield 1-([Z]-5-fluoro-2-methyl-1-[4-{methylsulfinyl}benzylidene]indene-3-acetyloxy)-3-(z,z,z-octadeca-6,9,12-trienoyloxy)propane as a waxy yellow solid.
(Diester of Acetyl Carnitine and GLA with 1,3-Propane Diol).
Freshly distilled thionyl chloride (1.5 ml) was slowly added to (R)-acetyl carnitine (1 g.) in a pear shaped flask. Care was taken to contain the reagents at the bottom of the flask until a clear solution resulted. After 4 hours at room temperature excess thionyl chloride was removed under reduced pressure (keeping the flask temperature less than 30° C.). This yielded the acid chloride as a highly hydroscopic white solid which was used immediately without further purification. To the flask were added 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (1.4 g, 4.17 mmol) and dry THF (4 ml). The mixture was allowed to stand overnight at room temperature. Tlc analysis (40% ethyl acetate/hexane) indicated that the reaction had gone to completion. The reaction mixture was added dropwise to hexane (250 ml) with vigorous stirring. A fine off white precipitate formed which was collected by centrifugation. On removal of the supernatant the solid was resuspended in hexane and centrifuged. The hexane washing procedure was carried out once more to yield 1-([R]-3-acetoxy-4-[trimethylammonio]butyroyloxy)-3-(z,z,z-octadeca-6,9,12-trienoyloxy)propane.
(Diester of Penicillin V and GLA with 1,3-Propane Diol).
A mixture of penicillin V (1 g, 2.9 mmol), 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (860 mg, 2.6 mmol), 1,3-dicyclohexylcarbodiimide (620 mg, 3 mmol) and 4-(N,N-dimethylamino)pyridine (catalytic amount) in dichloromethane (30 ml) was stirred overnight at room temperature. The reaction mixture was diluted with hexane (50 ml), filtered and concentrated to dryness. The residue was washed with hexane (3×50 ml) to remove unreacted 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane. The semisolid residue was disolved in diethyl ether (150 ml), washed with water (100 ml) and dried. The ether solution was diluted with hexane (125 ml) and the solution filtered through a bed of silica (4 cm×4 cm). The filtrate was concentrated, yielding 1-(3,3-dimethyl-7-oxo-6([phenoxyacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptan-2-oyloxy)-3-(z,z,z-octadeca-6,9,12-trienoyloxy)propane as a viscous colourless oil.
(Diester of Indomethacin and GLA with 1,3-Propane Diol).
A solution of 1,3-dicyclohexylcarbodiimide (58 g, 0.28 mol) and 4-(N,N-dimethylamino)pyridine (37.9 g, 0.31 mol) in methylene chloride (800 ml) was added with stirring to a solution of 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-hydroxypropane (79.5 g, 0.24 mol) and indomethacin (93.2 g, 0.26 mol) in methylene chloride (400 ml) at room temperature under nitrogen. Stirring was continued for 3 h. The mixture was filtered, concentrated and purified by dry column chromatography (ethyl acetate/hexane). The product fractions were pooled and concentrated, yielding 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-(1-(3-chlorobenzoyl)-5-methoxy-2-methyl-indole-3-acetyloxy)propane as a bright yellow viscous oil.
(Diester of Proline and GLA with 1,3-Propane Diol).
Part 1:
A solution of 1,3-dicyclohexylcarbodiimide (674 mg, 3.3 mmol) and and 4-(N,N-dimethylamino)pyridine (472 mg, 3.9 mmol) in methylene chloride (20 ml) was added with stirring to a solution of 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-hydroxypropane (1 g, 2.97 mmol) and N-tBOC-proline (671 mg, 3.12 mmol) in methylene chloride (20 ml) at room temperature under nitrogen. Stirring was continued for 7 h and the mixture stored overnight at 0° C. The mixture was filtered and purified by column chromatography (methanol/methylene chloride) to yield 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(N-tBOC-2-pyrrolidine carboxy)propane as a yellow oil.
Part 2:
The protected product was dissolved in 10% v/v anisole/trifluoroacetic acid (10 ml) and left at room temperature under nitrogen for 30 minutes. After tlc analysis indicated that deprotection was complete, the mixture was purified by column chromatography (8% methanol/42% methylene chloride/50% ethyl acetate) to yield 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-(2-pyrrolidine carboxy)propane as a viscous orange oil.
(Diester of Tryptophan and GLA with 1,3-Propane Diol).
Part 1:
A solution of 1,3-dicyclohexylcarbodiimide (674 mg, 3.3 mmol) and and 4-(N,N-dimethylamino)pyridine (472 mg, 3.9 mmol) in methylene chloride (20 ml) was added with stirring to a solution of 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-hydroxypropane (1 g, 2.97 mmol) and N-TSOC-tryptophan (950 mg, 3.12 mmol) in methylene chloride (20 ml) at room temperature under nitrogen. Stirring was continued for 7 h and the mixture stored overnight at 0° C. The mixture was filtered and purified by column chromatography (methanol/methylene chloride) to yield 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(N-tBOC-2-amino-3-indolylpropanoyloxy)propane as a yellow oil.
Part 2:
The protected product was dissolved in 10% v/v anisole/trifluoroacetic acid (6.1 ml) and left at room temperature under nitrogen for 15 minutes. After tlc analysis indicated that deprotection was complete, the mixture was purified by column chromatography (8% methanol/42% methylene chloride/50% ethyl acetate) to yield 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-(2-amino-3-indolylpropanoyloxy)propane as a viscous red wax.
(Diester of Phenylalanine and GLA with 1,3-Propane Diol).
Part 1:
A solution of 1,3-dicyclohexylcarbodiimide (1.77 g, 8.57 mmol) and and 4-(N,N-dimethylamino)pyridine (1.24 g, 10.13 mmol) in methylene chloride (30 ml) was added with stirring to a solution of 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-hydroxypropane (2.62 g, 7.79 mmol) and N-TBOC-phenylalanine (2.17 g, 8.18 mmol) in methylene chloride (30 ml) at room temperature under nitrogen. Stirring was continued for 7 h and the mixture stored overnight at 0° C. The mixture was filtered and purified by column chromatography (methanol/methylene chloride) to yield 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(N-tBOC-α-amino-β-phenyl-propionyloxy)propane as a yellow oil.
Part 2:
The protected product was dissolved in 10% v/v anisole/trifluoroacetic acid (17 ml) and left at room temperature under nitrogen for 30 minutes. After tlc analysis indicated that deprotection was complete, the mixture was purified by column chromatography (8% methanol/42% methylene chloride/50% ethyl acetate) to yield 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-(α-amino-β-phenyl-propionyloxy)propane as a viscous yellow oil.
(Diester of GABA and GLA with 1,3-Propane Diol).
Part 1:
A solution of 1,3-dicyclohexylcarbodiimide (0.84 g, 4.06 mmol) and and 4-(N,N-dimethylamino)pyridine (0.59 g, 4.79 mmol) in methylene chloride (10 ml) was added with stirring to a solution of 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-hydroxypropane (1.24 g, 3.96 mmol) and N-tBOC-GABA (0.75 g, 3.69 mmol) in methylene chloride (15 ml) at room temperature under nitrogen. Stirring was continued for 7 h and the mixture stored overnight at 0° C. The mixture was filtered and purified by column chromatography (ethyl acetate/hexane) to yield 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(N-tBOC-4-amino butanoyloxy)propane as a colourless oil.
Part 2:
The protected product was dissolved in 10% v/v anisole/trifluoroacetic acid (10.5 ml) and left at room temperature under nitrogen for 30 minutes. After tlc analysis indicated that deprotection was complete, the mixture was purified by column chromatography (8% methanol/42% methylene chloride/50% ethyl acetate) to yield 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-(4-amino butanoyloxy)propane as a yellow oil.
(Bis Diester of GLA and 1,3-Propane Diol with 3,3′-Thiodipropionic Acid).
A solution of 1,3-dicyclohexylcarbodiimide (660 mg, 3.22 mmol) and 4-(N,N-dimethylamino)pyridine (445 mg, 3.64 mmol) in methylene chloride (10 ml) was added with stirring to a solution of 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-hydroxypropane (940 mg, 2.8 mmol) and 3,3′-thiodipropionic acid (250 mg, 1.4 mmol) in methylene chloride (30 ml) at room temperature under nitrogen. Stirring was continued for 4 h. The mixture was diluted with hexane (50 ml), filtered, concentrated and purified by flash chromatography (ethyl acetate/hexane). The product fractions were pooled and concentrated yielding 3,3′-thio-di-(1-propionyloxy-(3-(z,z,z-octadeca-6,9,12-trienoyloxy)-propane)) as a colourless oil.
(Diester of (GLM Monoester with 1,3-Propane Diol) and GLA Alcohol with Succinic Acid).
Part 1:
A mixture of 1-(z,z,z-octadeca-6,9,12-trienyloxy)-3-hydroxypropane (10 g, 30 mmol) and succinic anhydride (3 g, 30 mmol) in dry THF (100 ml) was stirred at room temperature until a clear solution resulted. This solution was cooled to 0° C. and a solution of 1,8-diazabicyclo[5.4.0]undec-7-ene (4.5 ml, 30 mmol) in dry THF (50 ml) added dropwise to it. After 3 h, tlc analysis indicated that most of the monoester had reacted. A few more crystals of succinic anhydride were added and stirring continued for a further 30 min. The reaction mixture was diluted with diethyl ether (250 ml) and washed with 2M hydrochloric acid (2×250 ml), water (250 ml) and brine (250 ml). It was then dried (sodium sulfate) and concentrated to dryness. The material was used without any further purification.
Part 2:
Oxalyl chloride (3.9 ml, 45 mmol) was added to a solution of the product from part 1 (13 g, 30 mmol) in methylene chloride (75 ml). The mixture was stirred at room temperature under nitrogen for 2 h and concentrated to dryness. Hexane (75 ml) was added and the mixture concentrated to dryness. This process was repeated with two further portions of hexane (75 ml ea.). The material was used without any further purification.
Part 3:
A solution of the acid chloride prepared in part 2 (1 g 2.2 mmol) in methylene chloride (10 ml) was added dropwise to a solution of z,z,z-octadeca-6,9,12-trienol (635 mg, 2.4 mmol), triethylamine (1 ml, 7.2 mmol) and 4-(N,N-dimethylamino)pyridine (cat. amount) in methylene chloride (20 ml) at room temperature. On completion of reaction, the mixture was concentrated and purified by flash chromatography (ethyl acetate/hexane) to yield 1-(1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-propyl)-4-(z,z,z-octadeca-6,9,12-trienyl)butane-1,4-dioate as a colourless oil.
(Diester of 2,3,5-(Triiodobenzoic Acid and GLA with 1,3-Propane Diol)
2,3,5-Triiodobenzoyl chloride (1.54 g, 3.08 mmol) was added to a mixture of 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (1 g, 2.97 mmol) and triethylamine (1 ml) in methylene chloride (80 ml) and the resulting mixture stirred overnight at room temperature under nitrogen. The mixture was concentrated and purified by flash chromatography (ethyl acetate/hexane) to yield 1-(2,3,5-triiodobenzoyloxy)-3-(z,z,z-octadeca-6,9,12-trienoyloxy)propane.
(Diester of DHA and Liptic Acid with 1,3-Propane Diol)
Part 1:
A solution of z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoic acid (6.4 g, 19.5 mmol) in methylene chloride (225 ml) was added dropwise to a solution of 1,3-propane diol (7.5 g, 99 mmol), 1,3-dicyclohexylcarbodiimide (4.65 g, 20 mmol) and 4-(N,N-dimethylamino)pyridine (2.1 g, 17 mmol) in methylene chloride (225 ml) at −10° C. The reaction mixture was stirred overnight, warming up to room temperature. The reaction was filtered, concentrated and purified by flash chromatography (ethyl acetate/hexane) to yield 1-(z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoyloxy)-3-hydroxypropane as a pale yellow oil.
Part 2:
A solution of 1,3-dicyclohexylcarbodiimide (720 mg, 3.45 mmol) and 4-(N,N-dimethylamino)pyridine (480 mg, 3.9 mmol) in methylene chloride (30 ml) was added to a mixture of 1-(z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoyloxy)-3-hydroxypropane (1.16 g, 3 mmol) and lipoic acid (645 mg, 3.12 mmol) and methylene chloride (15 ml). After 2.5 h at room temperature under nitrogen the mixture was filtered, concentrated and purified by flash chromatography (ethyl acetate hexane) to yield (±)-1-(1,2-dithiolane-3-pentanoyloxy)-3-(z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoyloxy)propane as a yellow oil.
Phosphotnester of 2 Molecules of 3-Hydroxypropyl Ester of GLA and 1 Molecule of Methanol)
Part 1:
Triethylamine (3.74 ml, 26.8 mmol) was added dropwise to a cooled (0° C.) solution of freshly distilled phosphorus oxychloride (2.74 g, 17.9 mmol) in anhydrous THF (15 ml). To this mixture was added dropwise a solution of 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (5 g, 14.9 mmol) in anhydrous THF (15 ml). The temperature was kept at less than 10° C. throughout and the reaction kept under an atmosphere of nitrogen. Tlc analysis after 15 min. indicated complete disappearance of starting material. The mixture was filtered and concentrated. Toluene (50 ml) was added and the mixture concentrated. A further portion of toluene (50 ml) was added and removed.
Part 2:
A solution of 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (3 g, 9 mmol) in anhydrous THF (10 ml) was added dropwise to a solution of crude phosphochloridate (7.5 mmol) (half of the batch prepared in part 1 above) and triethylamine (3.2 ml, 22.5 mmol) in anhydrous THF (20 ml) at room temperature under nitrogen. The reaction was stored for 3 days at less than 10° C. Methanol (15 ml) was added and the reaction kept at room temperature until tlc indicated complete reaction of the phoshorochloridate to form the desired phosphotriester. Purification by flash chromatography (ethyl acetate/hexane) yielded methyl-di(z,z,z-octadeca-6,9,12-trienoyloxypropyl)-phosphate as a colourless oil.
(Phosphodiester of 2 Molecules of 3-Hydroxyproypl Ester of GLA)
Lithium bromide (104 mg, 1.13 mmol) in methyl ethyl ketone (1 ml) was added to a solution of methyl-di(z,z,z-octadeca-6,9,12-trienoyloxypropyl)-phosphate (0.85 g, 1.13 mmol) (prepared as in example 18) in methyl ethyl ketone (1 ml) and the mixture was heated under reflux for 1 h. After cooling, the mixture was dissolved in diethyl ether (3 ml) and extracted with water (3 ml). Emulsions formed were broken by the addition of a few drops of methanol. The organic layer was separated, dried (sodium sulfate), concentrated and purified by flash chromatography (methanol/chloroform) to yield di(z,z,z-octadeca-6,9,12-trienoyloxypropyl)phosphate as a waxy white solid.
(Phosphodiester of Ethanolamine and 3-Hydroxypropyl Ester of GLA)
Part 1:
A mixture of ethanolamine (0.5 ml, 8.25 mmol) and triethylamine (4.2 ml, 30 mmol) in anhydrous THF (20 ml) was added to a solution of crude phosphochloridate (7.5 mmol) (half of the batch prepared in example 18, part 1 above) in anhydrous THF (20 ml), keeping the temperature less than 10° C. Progress of the reaction was monitored by tlc. The mixture was stored for 3 days at less than 5° C. After that time it was filtered, concentrated, diluted with hexane (50 ml) and reconcentrated.
Part 2:
The product obtained from part 1 was dissolved in isopropanol (100 ml), acetic acid (10 ml) and water (40 ml) and the solution allowed to stand under nitrogen at room temperature. When tic indicated that the reaction had gone to completion the mixture was concentrated and partitioned between acetonitrile (50 ml) and hexane (50 ml). The hexane layer was separated, concentrated and purified by flash chromatography (methanol/chloroform 1 water). The pure fractions were pooled and concentrated. Addition of ethyl acetate crashed out (2-aminoethyl)-(z,z,z-octadeca-6,9,12-trienoyloxypropyl)phosphate as a waxy cream coloured solid which was collected by centrifugation.
(Phosphodiester of Choline and 3-Hydroxypropyl Ester of GLA).
Part 1:
A solution of 2-chloro-1,3,2-dioxaphospholane-2-oxide (430 mg, 3.4 mmol) in toluene (5 ml) was added to a cooled (0° C.) solution of 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (1 g, 2.98 mmol) and tnethylamine (0.57 ml, 4.1 mmol) in toluene (45 ml). The mixture was stirred overnight, warming up to room temperature. Tlc analysis indicated that the reaction had not gone to completion. Further portions of triethylamine (0.3 ml) and 2-chloro-1,3,2-dioxaphospholane-2-oxide (200 mg) (as a solution in toluene (5 ml)) were added and the reaction allowed to continue for a further overnight period. After that time tic indicated complete reaction and the mixture was concentrated.
Part 2:
The crude product from part 1 was dissolved in acetonitrile (60 ml). A quarter of this solution (15 ml) and trimethylamine (10 ml) were heated in a sealed tube at 60° C. for 5 h (CAUTION). The reaction was cooled and concentrated under a stream of nitrogen to yield (z,z,z-octadeca-6,9,12-trienoyloxypropyl)-(2-(N,N,N-trimethylammonium)ethyl)phosphate.
(Phosphomonoester of 3-Hydroxypropyl Ester of GLA).
A solution of 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (1.95 g, 5.8 mmol), pyridine (1.4 ml, 17.3 mmol) and anhydrous THF (15 ml) was added dropwise with stirring to a cooled (0° C.) solution of phosphorus oxychloride (1.02 g, 6.6 mmol) in anhydrous THF (5 ml) and the resultant mixture was kept at 0° C. for 3 h. Aqueous sodium bicarbonate (10% w/w, 10 ml) was added to the reaction mixture. After stirring for 20 min. the mixture was poured into ice/water (30 ml) and the solution acidified to pH 1 by the dropwise addition of 2M hydrochloric acid. The mixture was extracted with diethyl ether (2×30 ml). The ether extracts were combined, dried and concentrated. The resultant oil was azeotroped with dry pyridine to yield (z,z,z-octadeca-6,9,12-trienoyloxypropyl)phosphate as a viscous yellow oil.
(Phosphotriester of α-Tocopherot, Methanol and 3-Hydroaypropyl Ester of GLA).
Part 1:
Triethylamine (7.5 ml) was added to a solution of freshly distilled phosphorus oxychloride (1.26 g, 8.25 mmol) in anhydrous THF (7.5m) at 0° C. After 15 min. a solution of 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (2.5 g, 7.5 mmol) in anhydrous THF (7.5 ml) was added dropwise over a period of 30 min. at 0° C. Stirring at this temperature was continued for 30 min. after the end of addition. α-Tocopherol (3.23 g, 7.5 mmol) in anhydrous THF (5 ml) was added dropwise at 10° C. and the resultant mixture was then stirred at 10° C. for 1 h and then overnight, warming up to room temperature.
Part 2:
One quarter of the mixture prepared in part 1 above, triethylamine (0.8 ml, 6 mmol) and methanol (10 ml) were stirred overnight under nitrogen at room temperature. The reaction mixture was concentrated and partitioned between ethyl acetate (30 ml) and water (20 ml) with sodium chloride and methanol being added to break the emulsion. The ethyl acetate layer was dried, concentrated and purified by flash chromatography (chloroform) to yield methyl-(z,z,z-octadeca6,9,12-trienoyloxypropyl)-(α-tocopheryl)phosphate.
(Phosphodiester of α-Tocopherol and 3-Hydroxypropyl Ester of GLA).
Triethylamine (2 ml) and water (5 ml) were added to one quarter of the reaction mixture as prepared in example 23, part 1. The mixture was stirred under nitrogen in an ice bath for 1 h, acidified to pH 1 with 2M hydrochloric acid and extracted into ethyl acetate (20 ml) and methanol (5 ml). The extract was dried concentrated and purified by flash chromatography (chloroform) to yield (z,z,z-octadeca-6,9,12-trienoyloxypropyl)-(α-tocopheryl)phosphate.
(Diester of GLA and EPA with 1,5-Pentane Diol).
Part 1:
z,z,z-Octadeca-6,9,12-trienoyl chloride (2 g) was added dropwise to a solution of 1,5-dihydroxypentane (3.5 g), triethylamine (0.94 ml) and 4-(N,N-dimethylamino)pyridine (0.2 g) in methylene chloride (50 ml) with stirring at 0° C. under nitrogen. On completion of reaction as evidenced by tic the reaction mixture was washed with dilute hydrochloric acid and water, dried and purified by column chromatography yielding 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-5-hydroxypentane as a pale yellow oil.
Part 2:
As for Example 2, Part 2 but replacing 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane with 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-5-hydroxypentane and z-octadeca-9-enoic acid with z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoic acid. Chromatography yielded 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-5-(z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoyloxy)pentane as a pale yellow oil.
(Diester of GLA and EPA with 1,4-Dihydroxybenzene).
Prepared as in Example 25, Parts 1 and 2 but replacing 1,5-dihydroxypentane with 1,4-dihydroxybenzene in Part 1 and replacing methylene chloride with tetrahydrofuran as the solvent in Part 1. Chromatography yielded 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-4-(z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoyloxy)benzene as a pale yellow oil.
(Diester of GLA Alcohol with Succinic Acid)
Part 1:
A solution of 1,8-diazabicyclo[5.4.0]undec-7-ene (0.54 ml) in dry tetrahydrofuran (10 ml) was added dropwise to a cooled (0° C.) solution of z,z,z-octadeca-6,9,12-trienol (1 g) and succinic anhydride (0.36 g) in dry tetrahydrofuran (20 ml). On completion of reaction as evidenced by tlc, the reaction mixture was diluted with diethyl ether and washed with dilute hydrochloric acid, water and brine. The organic layer was dried, concentrated and used directly in the second part of the reaction.
Part 2:
A solution of 1,3-dicyclohexylcarbodiimide (0.83 g) and 4-(N,N-dimethylamino)pyridine (0.55 g) in methylene chloride (20 ml) was added to a solution of 1-(z,z,z-octadeca-6,9,12-trienyl)-butane-1,4-dioate (1.32 g) and z,z,z-octadeca-6,9,12-trienol (0.98 g) in methylene chloride (40 ml). On completion, as evidenced by tlc analysis, the reaction mixture was diluted with hexane, filtered, concentrated and purified by chromatography to yield 1,4-di(z,z,z-octadeca-6,9,12-trienyl)-butane-1,4-dioate as a pale yellow oil.
(Ester of Metronidazole with GLA)
Method A:
To a suspension of metronidazole (206 g) in anhydrous acetonitrile (2300 ml) and anhydrous pyridine (107 ml) was added with stirring at room temperature under nitrogen z,z,z-octadeca-6,9,12-trienoyl chloride (373 g) over a period of 30 mins. Shortly after the addition of the acid chloride a clear solution was formed and stirring was continued for 2 hours. The mixture was allowed to stand overnight and the solvent was removed in vacua (50° C./20 mm Hg). To the residue was added ethyl acetate (1000 ml), any precipitated solid being filtered off. The ethyl acetate solution was washed successively with brine, 2M hydrochloric acid, saturated aqueous sodium bicarbonate solution and finally brine. After drying (sodium sulfate) the solvent was removed to give an orange oil. This material was subjected to dry column chromatography giving 2-(2-methyl-5-nitroimidazolyl)ethyl-z,z,z-octadeca-6,9,12-trienoate as a pale yellow, non-distillable oil.
Method B:
Metronidazole (1.9 g) was suspended in toluene (30 ml) and with stirring the mixture was heated under reflux with a Dean and Stark head for 20 mins. to remove any water present. To the boiling solution was added, under nitrogen, z,z,z-octadeca-6,9,12-trienoyl chloride (2.96 g) dropwise over a period of 20 mins. The mixture was stirred and heated under reflux for a further 2 hours, giving a dark reaction mixture. After cooling, this mixture was subjected to dry column chromatography giving 2-(2-methyl-5-nitroimidazolyl)ethyl-z,z,z-octadeca-6,9,12-trienoate as a pale yellow, non distillable oil.
(Ester of Metronidazole with LA)
To a suspension of metronidazole (1.9 g) in dry dichloromethane (20 ml) was added successively 4-(N,N-dimethylamino)pyridine (1.22 g), 1,3-dicyclohexylcarbodiimide (2.2 g) and linoleic acid (2.8 g). The mixture was stirred at room temperature overnight. To the reaction was added 2M hydrochloric acid (20 ml) and stirring was continued. After filtration the organic layer was separated, washed with 50% saturated brine and finally with saturated aqueous sodium bicarbonate. The dichloromethane solution was dried (sodium sulfate) and evaporated in vacuo (30° C./20 mm Hg). To the resulting residue was added petrol (bp 30-60° C., 20 ml) and the mixture allowed to stand at room temperature for 2 hours, causing the precipitation of the remaining urea. This was removed by filtration and the filtrate was applied to a dry column giving 2-(2-methyl-5-nitroimidazolyl)ethyl-z,z-octadeca-9,12-dienoate as a pale yellow, non distillable oil.
(Eter of Metronidazole with DGLA)
In a similar manner but replacing the linoleic acid with the requisite amount of z,z,z-eicosa-8,11,14-trienoic acid there is prepared 2-(2-methyl-5-nitroimidazoloyl)ethyl-z,z,z-eicosa-8,11,14-trienoate.
(Ester of Metronidazole with DHA)
In a similar manner but replacing the linoleic acid with the requisite amount of z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoic acid there is prepared 2-(2-methyl-5-nitroimidazoloyl)ethyl-z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoate.
(Eter of Fluphenazine with GLA)
In a similar manner but replacing, the metronidazole with the requisite amount of the free base of 4-[3-[2-(trifluoromethyl)-10H-phenothiazin-10-yl]]-1-piperazineethanol (fluphenazine) and the linoleic acid with the requisite amount of GLA there is prepared 4-[3-[2-(trifluoromethyl)-10H-phenothiazin-10-yl]]-1-piperazineethyl-z,z,z-octadeca-6,9,12-trienoate.
(Bis Amide of Dapsone with GLA)
In a similar manner but replacing the metronidazole with the requisite amount of 4,4′-diamino diphenylsulfone (dapsone) and the linoleic acid with the requisite amount of GLA there is prepared 4,4′-(bis z,z,z-octadeca-6,9,12-trienoylamino)diphenylsulfone.
(Amide of Fluoxetine with GLA)
In a similar manner but replacing the metronidazole with the requisite amount of N-methyl-3-phenyl-3[α,α,α-trifluoro-p-tolyl]propylamine (fluoxetine) and the linoleic acid with the requisite amount of GLA there is prepared N-methyl-3-phenyl-3[α,α,α-trifluoro-p-tolyl]propyl-z,z,z-octadeca-6,9,12-trienamide.
(Amide of Tranylcypromine with GLA)
In a similar manner but replacing the metronidazole with the requisite amount of trans-1-amino-2-phenylcyclopropane (tranylcypromine) and the linoleic acid with the requisite amount of GLA there is prepared trans-1-(z,z,z-octadeca-6,9,12-trienoylamino)-2-phenyl cyclopropane.
(Amide of Ampicillin with GLA)
Triethylamine (0.3 ml) was added to a stirred suspension of ampicillin (0.7 g) in anhydrous DMF (120 ml) under a nitrogen atmosphere. To the resultant clear solution was added z,z,z-octadeca-6,9,12-trienoic acid, N-hydroxysuccinimide ester (0.75 g) while maintaining the reaction at 0-10° C. The reaction was stirred at this temperature for an additional hour before allowing the mixture to stand at room temperature overnight. Tlc analysis (40% THF/hexane) at this point indicated that most of the succinimide ester had reacted. Water (40 ml) was added to the reaction flask and the contents stirred. The solution was then neutralised and extracted with ethyl acetate. The extract was washed with water, dried (sodium sulfate) and concentrated to dryness leaving the crude product as a yellow glass. Trituration with hexane yielded 6-[(aminophenylacetyl) amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid-z,z,z-octadeca-6,9,12-trienamide as a yellow powder.
(Ester of GLA with GLA Alcohol)
1,3-dicyclohexylcarbodiimide (0.82 g) and 4-(N,N-dimethylamino)pyridine (0.48 g) in methylene chloride (5 ml) were added to a solution of z,z,z-octadeca-6,9,12-trienol (0.95 g) and z,z,z-octadeca-6,9,12-trienoic acid (1 g) in methylene chloride (10 ml) with stirring at room temperature under nitrogen. On completion of reaction as evidenced by tlc, hexane was added to the reaction mixture which was subsequently filtered and purified by column chromatography to yield z,z,z-mtadeca-6,9,12-trienyl-z,z,z-octadeca-6,9,12-trienoate as a pale yellow oil.
(Ester of EPA with GLA Alcohol)
Prepared as in Example 37 but replacing z,z,z-octadeca-6,9,12-trienoic acid with z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoic acid.
(diEPA Ester of Pyridoxal)
To a suspension of pyridoxal hydrochloride (1.0 g) in methylene chloride (20 ml) was added triethylamine (2.0 ml). A clear yellow solution developed. With cooling in ice, z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoyl chloride (1.73 g) (prepared by reaction of EPA with oxalyl chloride in methylene chloride). The mixture was stirred overnight under nitrogen, warming up to room temperature. After dilution with an equal volume of methylene chloride, the mixture was extracted with 2M hydrochloric acid (20 ml), washed with water (3×20 ml), dried and concentrated. Purification by flash chromatography (ethyl acetate/hexane) yielded 2-methyl-3-z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoyloxy-4-formyl-5-(z,z,z,z,z-eicosa-5,8,11,14,17-pentaenoyloxy) methyl pyridine as a clear oil.
(GLA Ester of Pyridoxal)
A solution of z,z,z-octadeca-6,9,12-trienoyl chloride (800 mg, 2.7 mmol) in methylene chloride (10 ml) was added slowly dropwise to a mixture of pyridoxal hydrochloride (500 mg, 2.45 mmol), triethylamine (1 ml, 7.2 mmol) and 4-(N,N-dimethylamino)pyridine (few mg, catalytic amount) in methylene chloride (20 ml) at 0° C. under nitrogen. On completion, as indicated by tlc, the mixture was concentrated and purified by flash chromatography (ethyl acetate/hexane), yielding 2-methyl-3-hydroxy-4-formyl-5-(z,z,z-octadeca-6,9,12-trienoyloxy)methyl pyridine as a colourless oil which subsequently solidified.
(Bis GLA Ester of Pyridoxine)
A solution of z,z,z-octadeca-6,9,12-trienoyl chloride (650 mg, 2.2 mmol) in methylene chloride (10 ml) was added slowly dropwise to a mixture of pyridoxine hydrochloride (206 mg, 1 mmol), triethylamine (0.7 ml, 5 mmol) and 4-(N,N-dimethylamino)pyridine (few mg, catalytic amount) in methylene chloride (20 ml) at 0° C.l under nitrogen. On completion, as indicated by tic, (4 h) the mixture was concentrated and purified by flash chromatography (ethyl acetate/hexane), yielding 2-methyl-3-hydroxy-4,5-di(z,z,z-octadeca-6,9,12-trienoyloxy)methyl pyridine as a colourless oil.
(Diester of Metronidazole and GLA Alcohol with Succinic Acid)
A solution of 1,3-dicyclohexylcarbodiimide (780 mg, 3.8 mmol) and 4-(N,N-dimethylamino)pyridine (530 mg, 4.3 mmol) in methylene chloride (15 ml) was added with stirring to a solution of GLA alcohol succinate monoester (1.25 g, 3.3 mmol) (prepared as in Example 27, part 1) and metronidazole (620 mg, 3.6 mmol) in methylene chloride (30 ml) at room temperature under nitrogen. On completion of reaction, as indicated by tlc, the mixture was diluted with hexane, filtered, concentrated and purified by flash chromatography (ethyl acetate/hexane). The product fractions were pooled and concentrated, yielding 1-(2-(2-methyl-5-nitroimidazoloyl)ethyl)-4-(z,z,z-octadeca-6,9,12-trienyl)-1,4-butanedioate as a colourless oil.
(Succinic Acid, 1-GLA Alcohol Ester, 4-Tranylcypromine Amide)
A solution of 1,3-dicyclohexylcarbodiimide (315 mg, 1.52 mmol) and 4-(N,N-dimethylamino)pyridine (210 mg, 1.72 mmol) in methylene chloride (10 ml) was added with stirring to a solution of GLA alcohol succinate monoester (500 mg, 1.32 mmol) (prepared as in Example 27, part 1) and tranylcypromine (225 mg, 1.32 mmol) in methylene chloride (20 ml) at room temperature under nitrogen. On completion of reaction, as indicated by tlc, the mixture was diluted with hexane, filtered, concentrated and purified by flash chromatography (ethyl acetate/hexane). The product fractions were pooled and concentrated, yielding trans-1-(z,z,z-octadeca-6,9,12-trienyloxycarbonyl butyloxyamino)-2-phenyl cyclopropane as a colourless oil.
(GLA ester of α-Tocopherol).
z,z,z-Octadeca-6,9,12-trienoyl chloride (2.96 g, 10 mmol) was added dropwise with stirring over the course of 2-3 minutes to a solution of (±)-α-tocopherol (4.3 g, 10 mmol) and pyridine (0.885 ml, 11 mmol) in methylene chloride (35 ml) under nitrogen at −5° C. The reaction was then stirred overnight, warming up to room temperature. Tlc analysis showed that the reaction had gone substantially towards completion. The reaction mixture was washed with water (100 ml), 2M hydrochloric acid (10 ml in 100 ml water) and water (4×100 ml). The organic layer was dried (sodium sulfate) and concentrated. Purification by flash chromatography (ether/hexane) yielded (±)-2,5,7,8-tetramethyl-2-(4′,8′,12′-trimethyldecyl)-6-chromanyl-z,z,z-octadeca-6,9,12-trienoate as a pale yellow oil.
(DH Ester of Dehydroepiandrosterone)
To a cooled (0° C) mixture of dehydroepiandrosterone (1 g) and triethylamine (1 ml) in methylene chloride (20 ml) was added z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoyl chloride (1.33 g) (prepared by reaction of DHA with oxalyl chloride in methylene chloride). The mixture was stirred overnight, warming up to room temperature. It was diluted with methylene chloride (20 ml), extracted with 2M hydrochloric acid (20 ml), washed with water (2×20 ml), dried and concentrated. Purification by flash chromatography (ethyl acetate/hexane) yielded dehydroepiandrost-5-en-17-one-3 (z,z,z,z,z,z-docosa-4,7,10,13,16,19-hexaenoate) as a clear oil.
Diester of GLA and GLA Alcohol with Glycolic Acid.
Part 1:
A solution of chloroacetyl chloride (0.4 ml, 5 mmol) in methylene chloride (10 ml) was added dropwise to a solution of z,z,z-octadeca-6,9,12-trienol (1 g, 3.8 mmol) and triethylamine (1.4 ml, 10 mmol) in methylene chloride (20 ml) at 0° C. Progress of reaction was monitored by tlc. After 3 h the reaction had gone substantially but not completely towards completion. A few more drops of chloroacetyl chloride were added. Tlc analysis within 5 minutes showed the reaction to be complete. The mixture was washed with water (2×50 ml) and brine (50 ml), dried (sodium sulfate) and concentrated. Toluene (50 ml) was added to remove azeotropically last traces of water. This yielded the chloroacetyl ester of GLA alcohol as a dark brown oil which was used without further purification.
Part 2:
A mixture of z,z,z-octadeca-6,9,12-trienoic acid (700 mg, 2.5 mmol) and cesium carbonate (410 mg, 1.25 mmol) was swirled in methanol until a clear solution resulted. The mixture was then concentrated and kept at 40° C. under high vacuum for 1 h. This yielded the cesium salt of GLA which was used without further purification.
Part 3:
To the flask containing the cesium salt of GLA as prepared in part 2, was added the chloroacetyl ester of GLA alcohol (part 1) (500 mg, 1.5 mmol) and dry DMF (15 ml). The reaction was stirred under nitrogen at room temperature. After 90 minutes, tlc analysis showed the reaction to be complete. The reaction mixture was extracted with hexane (2×40 ml) and the hexane extract washed with brine (2×50 ml) and water (50 ml), dried (sodium sulfate) and concentrated to yield z,z,z-octadeca-6,9,12-trienyl-(2-(z,z,z-octadeca-6,9,12-trienyloxy)acetate) as a colourless oil.
(GLA Ester of Hydrocortisone)
A solution of z,z,z-octadeca-6,9,12-trienoyl chloride (450 mg, 1.52 mmol) in methylene chloride (10 ml) was added slowly dropwise to a mixture of hydrocortisone (500 mg, 1.38 mmol), triethylamine (420 μl, 3 mmol) and 4-(N,N-dimethyl amino)pyridine (few mg, catalytic amount) in methylene chloride (20 ml) at 0° C. under nitrogen. Tlc analysis after 4 h indicated that the reaction had gone to completion. The mixture was concentrated and purified by flash chromatography (ethyl acetate/hexane), yielding hydrocortisone-21-(z,z,z-octadeca-6,9,12-trienoate) as a colourless oil.
Diester of Indomethacin and GLA Alcohol with Glycolic Acid.
Part 1:
A mixture of indomethacin (895 mg, 2.5 mmol) and cesium carbonate (410 mg, 1.25 mmol) was swirled in methanol until a clear solution resulted. The solution was then concentrated and kept at 40° C. under high vacuum for 1 h. This yielded the cesium salt of indomethacin as a bright yellow solid.
Part 2:
To the flask containing the cesium salt of indomethacin as prepared in part 1 was added the chloroacetyl ester of GLA alcohol (prepared as in Example 46 (part 1) (500 mg, 1.5 mmol) and dry DMF (15 ml). The reaction was stirred under nitrogen at room temperature, progress of reaction being monitored by tlc. After an overnight period in the fridge, tlc analysis showed the reaction to be complete. The mixture was partitioned between water (50 ml) and ethyl acetate (50 ml). A few ml of brine were added to break the emulsion. The ethyl acetate layer was washed with water (3=ml), dried (sodium sulfate), filtered through a pad of silica and concentrated to yield z,z,z-octadeca-6,9,12-trienyl-(2-(1-(4-chlorobenzoyl)-5-methoxy-2-methylindole-3-acetyloxy)acetate) as a bright yellow oil.
Diester of 4-Phenylbutanoic Acid and GLA with 1,3-propane Diol).
A solution of 1,3-dicyclohexylcarbodiimide (710 mg, 3.45 mmol) and 4-(N,N-dimethylamino)pyridine (475 mg, 3.9 mmol) in methylene chloride (10 ml) was added to a solution of 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-hydroxypropane (1 g, 3 mmol) and 4-phenylbutanoic acid (520 mg, 3.15 mmol) in methylene chloride (15 ml). The resultant mixture was stirred at room temperature under nitrogen until it was complete as indicated by tlc. The mixture was filtered, concentrated and purified by flash chromatography to yield 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(4-phenylbutanoyloxy)propane.
(Diester of Phenylacetic Acid and GLA with 1,3-Propane Diol)
In a similar manner to Example 49 but replacing the 4-phenylbutanoic acid with phenylacetic acid (430 mg, 3.15 mmol) was prepared 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(phenylacetoxy)propane.
(Diester of trans-Cinnamic Acid and GLA with 1,3-Propane Diol)
In a similar manner to Example 49 but replacing the 4-phenylbutanoic acid with trans-cinnamic acid (470 mg, 3.15 mmol) was prepared 1-(z,z,z-octadeca-6,9,12-trienoyloxy)-3-(trans-cinnamoyloxy)propane.
Redden, Peter, Bradley, Paul, Manku, Mehar, Knowles, Philip, Wakefield, Paul, Clarkson, Sherri, Pitt, Andrea, McMordie, Austin
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