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  • Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

Definitions

• This invention relates to vitamin D compounds, and more particularly to 2-methylene-19-nor-(20S-24S)-1a,25-dihydroxyvitamin D 2 and to pharmaceutical formulations that include this compound.
• the invention also relates to the use of 2-methylene-19-nor-(20S-24S)-1 ⁇ ,25-dihydroxyvitamin D 2 or salts thereof in the preparation of medicaments for use in treating various diseases.
• the natural hormone, 1 ⁇ ,25-dihydroxyvitamin D 3 (also referred to as l ⁇ -dihydroxycholecalciferol and calcitriol) and its analog in the ergosterol series, i.e. 1 ⁇ ,25-dihydroxyvitamin D 2 , are known to be highly potent regulators of calcium homeostasis in animals and humans, and their activity in cellular differentiation has also been established, Ostrem et al., Proc. Natl. Acad. Sci. USA, 84, 2610 (1987). Many structural analogs of these metabolites have been prepared and tested, including 1 ⁇ -hydroxyvitamin D 3 , lohydroxyvitamin D 2 , various side chain homologated vitamins, and fluorinated analogs.
• Some of these compounds exhibit an interesting separation of activities in cell differentiation and calcium regulation. This difference in activity may be useful in the treatment of a variety of diseases as renal osteodystrophy, vitamin D- resistant rickets, osteoporosis, psoriasis, and certain malignancies.
• the structure of 1 ⁇ r,25-dihydroxyvitamin D 3 and the numbering system used to denote the carbon atoms in this compound are shown below.
• Another class of vitamin D analogs i.e. the so called 19-nor- vitamin D compounds, is characterized by the replacement of the A-ring exocyclic methylene group (carbon 19), typical of the vitamin D system, by two hydrogen atoms.
• Biological testing of such 19-nor-analogs revealed a selective activity profile with high potency in inducing cellular differentiation, and very low calcium mobilizing activity.
• these compounds are potentially useful as therapeutic agents for the treatment of malignancies, or the treatment of various skin disorders.
• the invention provides 2-methylene-19-nor-(20S-24S)-1 ⁇ ,25- dihydroxyvitamin D 2 and related compounds, pharmaceutical formulations that include 2-methylene-19-nor-(20S-24S)-1 ⁇ ,25-dihydroxyvitamin D 2 , and the use of this compound in the preparation of medicaments for use in treating various disease states.
• the invention provides a compound having the formula I shown below
• X 1 , X 2 , and X 3 may be the same or different and are independently selected from H or hydroxy-protecting groups.
• X 1 and X 2 are both hydroxy protecting groups such as silyl groups.
• X 1 and X 2 are both t-butyldimethylsilyl groups.
• X 1 , X 2 , and X 3 are all H such that the compound is 2-methylene- 19-nor-(20S-24S)-1 ⁇ ,25-dihydroxyvitamin D 2 having the formula IA as shown below:
• the compound of formula IA is a compound of formula IB and has the structure shown below:
• the above compound exhibits a desired, and highly advantageous, pattern of biological activity.
• This compound is characterized by relatively high binding to vitamin D receptors, as compared to that of 1 ⁇ ,25-dihydroxyvitamin U3, and similar intestinal calcium transport activity.
• the above compound is comparable to 1 ⁇ ,25-dihydroxyvitamin D 3 in it's ability to mobilize calcium from bone.
• this compound can be characterized as having some calcemic activity.
• it may be useful as a therapy for suppression of secondary hyperparathyroidism of renal osteodystrophy and for the treatment of other calcium imbalance disorders such as osteopenia.
• the compound of the invention is also especially suited for treatment and prophylaxis of human disorders which are characterized by an imbalance in the immune system, e.g. in autoimmune diseases, including multiple sclerosis, lupus, diabetes mellitus, host versus graft reaction, and rejection of organ transplants; and additionally for the treatment of inflammatory diseases, such as rheumatoid arthritis, asthma, and inflammatory bowel diseases such as celiac disease, ulcerative colitis and Crohn's disease. Acne, alopecia and hypertension are other conditions which may be treated with the compound of the invention.
• the above compound is also characterized by relatively high cell differentiation activity.
• this compound also provides a therapeutic agent for the treatment of psoriasis, or as an anti-cancer agent, especially against leukemia, colon cancer, breast cancer and prostate cancer.
• this compound provides a therapeutic agent for the treatment of various skin conditions including wrinkles, lack of adequate dermal hydration, i.e. dry skin, lack of adequate skin firmness, i.e. slack skin, and insufficient sebum secretion. Use of this compound thus not only results in moisturizing of skin but also improves the barrier function of skin.
• the compounds of the invention may be used to prepare pharmaceutical formulations or medicaments that include a compound of the invention in combination with a pharmaceutically acceptable carrier. Such pharmaceutical formulations and medicaments may be used to treat various biological disorders such as those described herein. Methods for treating such disorders typically include administering an effective amount of the compound or an appropriate amount of a pharmaceutical formulation or a medicament that includes the compound to a subject suffering from the biological disorder.
• the subject is a mammal.
• the mammal is selected from a rodent, a primate, a bovine, an equine, a canine, a feline, an ursine, a porcine, a rabbit, or a guinea pig.
• the mammal is a rat or is a mouse.
• the subject is a primate such as, in some embodiments, a human.
• the compound may be present in a composition to treat the above- noted diseases and disorders in an amount from about 0.01 ⁇ g/gm to about 1 mg/gm of the composition, preferably from about 0.1 ⁇ g/gm to about 500 ⁇ g/gm of the composition, and may be administered topically, transdermal ⁇ , orally, or parenterally in dosages of from about 0.01 ⁇ g/day to about 1 mg/day, preferably from about 0.1 ⁇ g/day to about 500 ⁇ g/day.
• Figures 1-5 illustrate various biological activities of 2-methylene-19- nor-(20S-24S)-1 ⁇ ,25-dihydroxyvitamin D 2 (referred to as “(20S/24S) 2-MD 2 " in the Figures) compared with those of the native hormone 1 ⁇ ,25-dihydroxyvitamin D 3 (referred to as “1 ,25(OH) 2 D 3 " in the Figures).
• Figure 1 is a graph comparing the relative activity of (20S/24S) 2-
• Figure 2 is a graph comparing the percent HL-60 cell differentiation as a function of the concentration of (20S/24S) 2-MD 2 with that of 1 ,25(OH) 2 D 3 .
• Figure 3 is a graph comparing the in vitro transcription activity of
• Figure 4 is a bar graph comparing the bone calcium mobilization activity of (20S/24S) 2-MD 2 with that of 1 ,25(OH) 2 D 3 .
• Figure 5 is a bar graph comparing the intestinal calcium transport activity of (20S/24S) 2-MD 2 with that of 1 ,25(OH) 2 D 3 .
• Preparation of 2-methylene-19-nor-(20S-24S)-1 a,25- dihydroxyvitamin D 2 can be accomplished by condensing an appropriate bicyclic Windaus-Grundmann type ketone (II) with the allylic phosphine oxide III followed by deprotection (removal of the Yi and Y 2 groups).
• an appropriate bicyclic Windaus-Grundmann type ketone (II) with the allylic phosphine oxide III followed by deprotection (removal of the Yi and Y 2 groups).
• Yi and Y 2 are preferably hydroxy-protecting groups such as silyl protecting groups.
• the t-butyldimethylsilyl (TBDMS) group is an example of a particularly useful hydroxy-protecting group.
• Phosphine oxide III is a convenient reagent that can be used to prepare a large number of 19-nor vitamin D compounds and may be prepared according to the procedures described by Sicinski et al., J. Med. Chem., 41, 4662 (1998), DeLuca et al., U.S. Patent No. 5,843,928; Perlman et al., Tetrahedron Lett. 32, 7663 (1991); and DeLuca et al., U.S. Patent No. 5,086,191.
• Scheme I shows the general procedure for synthesizing phosphine oxide III as outlined in U.S. Patent No. 5,843,928 which is hereby incorporated by reference in its entirety as if fully set forth herein.
• Alkenes prepared using this procedure may then be carried through to prepare a phosphine oxide in an analogous manner to that used to prepare phosphine oxide H in Scheme I.
• an alkene analogous to compound C of Scheme I may be reduced with (Ph 3 P) 3 RhCI and H 2 to provide other vitamin D analogs.
• Rh 3 P RhCI
• Hydraindanones of structure Il can prepared by known methods or adapted methods as will be readily apparent to one of skill in the art and described herein. Specific examples of some important bicyclic ketones used to synthesize vitamin D analogs are those described in Mincione et ai, Synth. Commun 19, 723, (1989); and Peterson et al., J. Org. Chem. 51, 1948, (1986).
• hydroxy-protecting group signifies any group commonly used for the temporary protection of the hydroxy (-OH) functional group, such as, but not limited to, alkoxycarbonyl, acyl, alkylsilyl or alkylarylsilyl groups (hereinafter referred to simply as “silyl” groups), and alkoxyalkyl groups.
• Alkoxycarbonyl protecting groups are alkyl-O-CO- groups such as methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, isobutoxycarbonyl, tert-butoxycarbonyl, benzyloxycarbonyl or allyloxycarbonyl.
• acyl signifies an alkanoyl group of 1 to 6 carbons, in all of its isomeric forms, or a carboxyalkanoyl group of 1 to 6 carbons, such as an oxalyl, malonyl, succinyl, glutaryl group, or an aromatic acyl group such as benzoyl, or a halo, nitro or alkyl substituted benzoyl group.
• Alkoxyalkyl protecting groups are groups such as methoxymethyl, ethoxymethyl, methoxyethoxymethyl, or tetrahydrofuranyl and tetrahydropyranyl.
• Preferred silyl-protecting groups are trimethylsilyl, triethylsilyl, t-butyldimethylsilyl, dibutylmethylsilyl, diphenylmethylsilyl, phenyldimethylsilyl, diphenyl-t-butylsilyl and analogous alkylated silyl radicals.
• aryl specifies a phenyl-, or an alkyl-, nitro- or halo-substituted phenyl group.
• An extensive list of protecting groups for the hydroxy functionality may be found in Protective Groups in Organic Synthesis, Greene, T.W.; Wuts, P. G. M., John Wiley & Sons, New York, NY, (3rd Edition, 1999) which can be added or removed using the procedures set forth therein and which is hereby incorporated by reference in its entirety and for all purposes as if fully set forth herein.
• a "protected hydroxy” group is a hydroxy group derivatized or protected by any of the above groups commonly used for the temporary or permanent protection of hydroxy functional groups, e.g., the silyl, alkoxyalkyl, acyl or alkoxycarbonyl groups, as previously defined.
• Compound 3 is then treated with triethylsilyl trifluoromethane sulfonate followed by base hydrolysis (heating with KOH in methanol) to yield compound 4. Again, these reactions are followed by the same TLC system as above.
• Compound 4 is oxidized with sulfur trioxide in pyridine, dimethylsulfoxide and triethylamine to provide 5. The reaction is followed by TLC using 10% in acetic acid. Treatment of 5 with sodium bicarbonate to epimerize the compound followed by reduction with sodium borohydride in methanol provides alcohol 6 and is detected by TLC with 20% ethyl acetate in hexane.
• BL21(DE3) Codon Plus RIL cells and purified to homogeneity using two different column chromatography systems.
• the first system was a nickel affinity resin that utilizes the C-terminal histidine tag on this protein.
• the protein that was eluted from this resin was further purified using ion exchange chromatography (S-Sepharose Fast Flow). Aliquots of the purified protein were quick frozen in liquid nitrogen and stored at -80 0 C until use.
• the protein was diluted in TEDK 50 (50 mM Tris, 1.5 mM EDTA, pH 7.4, 5 mM DTT, 150 mM KCI) with 0.1% Chaps detergent.
• the receptor protein and ligand concentration was optimized such that no more than 20% of the added radiolabeled ligand was bound to the receptor.
• Radiolabeled and unlabeled ligands were added to 100 mcl of the diluted protein at a final ethanol concentration of ⁇ 10%, mixed and incubated overnight on ice to reach binding equilibrium. The following day, 100 mcl of hydroxylapatite slurry (50%) was added to each tube and mixed at 10-minute intervals for 30 minutes. The hydroxylapaptite was collected by centrifugation and then washed three times with Tris-EDTA buffer (50 mM Tris, 1.5 mM EDTA, pH 7.4) containing 0.5% Titron X-100.
• Tris-EDTA buffer 50 mM Tris, 1.5 mM EDTA, pH 7.4
• the pellets were transferred to scintillation vials containing 4 ml of Biosafe Il scintillation cocktail, mixed and placed in a scintillation counter. Total binding was determined from the tubes containing only radiolabeled ligand.
• HL60 Human promyelocytic leukemia
• HL60 cells were plated at 1.2 x 10 5 cells/ml. Eighteen hours after plating, cells in duplicate were treated with drug. Four days later, the cells were harvested and a nitro blue tetrazolium reduction assay was performed (Collins et a/., 1979; J. Exp. Med. 149:969-974). The percentage of differentiated cells was determined by counting a total of 200 cells and recording the number that contained intracellular black-blue formazan deposits. Verification of differentiation to monocytic cells was determined by measuring phagocytic activity (data not shown).
• 2-Methylene-19-nor-(20S-24S)-1 ⁇ ,25-dihydroxyvitamin D 2 is almost equal to the native hormone in binding to the vitamin D receptor as shown in Figure 1.
• 2-Methylene-19-nor-(20S-24S)-1 ⁇ ,25-dihydroxyvitamin D2 is also almost equal to the native hormone in inducing differentiation of HL-60 cells (Figure 2), and it is slightly more effective than 1 ,25-(OH) 2 D 3 in causing transcription, as shown in Figure 3.
• 2-Methylene-19-nor-(20S ⁇ 24S)-1 ⁇ ,25- dihydroxyvitamin D 2 has bone calcium mobilizing activity comparable to 1 ,25(OH) 2 D 3 ( Figure 4), and the compound does retain some ability to elevate intestinal calcium transport (Figure 5).
• This compound will find use as an effective therapy for secondary hyperparathyroidism of dialysis patients and calcium imbalance disorders such as, but not limited to, osteopenia, osteoporosis, and the like. It may also be used for the treatment of malignancy of colon, prostate, and breast, and can be used in the therapy of autoimmune diseases such as multiple sclerosis, diabetes type 1 and type 2 diabetes, inflammatory bowel diseases, lupus, rheumatoid arthritis and Lou Gehrig's Disease.
• autoimmune diseases such as multiple sclerosis, diabetes type 1 and type 2 diabetes, inflammatory bowel diseases, lupus, rheumatoid arthritis and Lou Gehrig's Disease.
• the compounds of the invention are also useful in preventing or treating obesity, inhibiting adipocyte differentiations, inhibiting SCD-1 gene transcription, and/or reducing body fat in animal subjects. Therefore, in some embodiments, a method of preventing or treating obesity, inhibiting adipocyte differentiations, inhibiting SCD-1 gene transcription, and or reducing body fat in animal subject includes administering to the animal subject, an effective amount of the compound or a pharmaceutical composition that includes the compound. Administration of the compound or the pharmaceutical composition to the subject inhibits adipocyte differentiation, inhibits gene transcription, and/or reduces body fat in the animal subject.
• the compounds defined by formula I, formula IA, and formula IB may be formulated for pharmaceutical applications as a solution in innocuous solvents, or as an emulsion, suspension or dispersion in suitable solvents or carriers, or as pills, tablets or capsules, together with solid carriers, according to conventional methods known in the art. Any such formulations may also contain other pharmaceutically acceptable and non-toxic excipients such as stabilizers, anti-oxidants, binders, coloring agents or emulsifying or taste-modifying agents. Pharmaceutically acceptable excipients and carriers are generally known to those skilled in the art and are thus included in the instant invention. Such excipients and carriers are described, for example, in "Remingtons Pharmaceutical Sciences” Mack Pub. Co., New Jersey (1991), which is hereby incorporated by reference in its entirety and for all purposes as if fully set forth herein.
• the compounds may be administered orally, topically, parenterally, or transdermally.
• the compounds are advantageously administered by injection or by intravenous infusion or suitable sterile solutions, or in the form of liquid or solid doses via the alimentary canal, or in the form of creams, ointments, patches, or similar vehicles suitable for transdermal applications.
• doses of from 0.001 ⁇ g to about 1 mg per day of the compound are appropriate for treatment purposes.
• an appropriate and effective dose may range from 0.01 ⁇ g to 1 mg per day of the compound.
• an appropriate and effective dose may range from 0.1 ⁇ g to 500 ⁇ g per day of the compound.
• Such doses will be adjusted according to the type of disease or condition to be treated, the severity of the disease or condition, and the response of the subject as is well understood in the art.
• the compound may be suitably administered alone, or together with another active vitamin D compound.
• compositions for use in the invention include an effective amount of 2-methylene-19-nor-(20S-24S)-1 ⁇ ,25-dihydroxyvitamin D 2 as the active ingredient, and a suitable carrier.
• An effective amount of the compound for use in accordance with some embodiments of the invention will generally be a dosage amount such as those described herein, and may be administered topically, transdermally, orally, nasally, rectally, or parenterally.
• the compound of formula IA and formula IB may be advantageously administered in amounts sufficient to effect the differentiation of promyelocytes to normal macrophages. Dosages as described above are suitable, it being understood that the amounts given are to be adjusted in accordance with the severity of the disease, and the condition and response of the subject as is well understood in the art.
• the compound may be formulated as creams, lotions, ointments, aerosols, suppositories, topical patches, pills, capsules or tablets, or in liquid form as solutions, emulsions, dispersions, or suspensions in pharmaceutically innocuous and acceptable solvent or oils, and such preparations may contain, in addition, other pharmaceutically innocuous or beneficial components, such as stabilizers, antioxidants, emulsifiers, coloring agents, binders or taste-modifying agents.
• other pharmaceutically innocuous or beneficial components such as stabilizers, antioxidants, emulsifiers, coloring agents, binders or taste-modifying agents.
• the formulations of the present invention comprise an active ingredient in association with a pharmaceutically acceptable carrier therefore and optionally other therapeutic ingredients.
• the carrier must be "acceptable” in the sense of being compatible with the other ingredients of the formulations and not deleterious to the recipient thereof.
• Formulations of the present invention suitable for oral administration may be in the form of discrete units as capsules, sachets, tablets or lozenges, each containing a predetermined amount of the active ingredient; in the form of a powder or granules; in the form of a solution or a suspension in an aqueous liquid or non-aqueous liquid; or in the form of an oil-in-water emulsion or a water-in-oil emulsion.
• Formulations for rectal administration may be in the form of a suppository incorporating the active ingredient and carrier such as cocoa butter, or in the form of an enema.
• Formulations suitable for parenteral administration conveniently comprise a sterile oily or aqueous preparation of the active ingredient which is preferably isotonic with the blood of the recipient.
• Formulations suitable for topical administration include liquid or semi-liquid preparations such as liniments, lotions, applicants, oil-in-water or water-in-oil emulsions such as creams, ointments or pastes; or solutions or suspensions such as drops; or as sprays.
• liquid or semi-liquid preparations such as liniments, lotions, applicants, oil-in-water or water-in-oil emulsions such as creams, ointments or pastes; or solutions or suspensions such as drops; or as sprays.
• a nebulizer or an atomizer can be used for nasal administration.
• the formulations, when dispensed preferably have a particle size in the range of 10 to 100 microns.
• formulations may conveniently be presented in dosage unit form and may be prepared by any of the methods well known in the art of pharmacy.
• dosage unit is meant a unitary, i.e., a single dose which is capable of being administered to a patient as a physically and chemically stable unit dose comprising either the active ingredient as such or a mixture of it with solid or liquid pharmaceutical diluents or carriers.

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