WO1999026953A1 - Phosphoethanolamine conjugates of vitamin d compounds - Google Patents

Phosphoethanolamine conjugates of vitamin d compounds Download PDF

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Publication number
WO1999026953A1
WO1999026953A1 PCT/US1997/021931 US9721931W WO9926953A1 WO 1999026953 A1 WO1999026953 A1 WO 1999026953A1 US 9721931 W US9721931 W US 9721931W WO 9926953 A1 WO9926953 A1 WO 9926953A1
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WIPO (PCT)
Prior art keywords
vitamin
methyl
hydrogen
formula
phosphocholine
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PCT/US1997/021931
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French (fr)
Inventor
Andrew C. Peterson
Parvin T. Yazdi
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Clarion Pharmaceuticals, Inc.
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Application filed by Clarion Pharmaceuticals, Inc. filed Critical Clarion Pharmaceuticals, Inc.
Priority to EP97948592A priority Critical patent/EP1034178A1/en
Priority to AU54631/98A priority patent/AU5463198A/en
Priority to PCT/US1997/021931 priority patent/WO1999026953A1/en
Publication of WO1999026953A1 publication Critical patent/WO1999026953A1/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02—Phosphorus compounds
    • C07F9/06—Phosphorus compounds without P—C bonds
    • C07F9/08—Esters of oxyacids of phosphorus
    • C07F9/09—Esters of phosphoric acids
    • C07F9/117—Esters of phosphoric acids with cycloaliphatic alcohols

Definitions

  • the present invention relates to certain phosphoethanolamine conjugates of vitamin D compounds, pharmaceutically acceptable salts thereof, and to pharmaceutical compositions thereof.
  • novel compounds herein described possess anti-tumor, anti-psoriatic and anti-inflammatory activities.
  • Amidothiophosphates and glyceroamidothiophosphate derivatives of vitamin D 3 are known: S.D. Stamatov and S. Gronowitz, Lipids Vol. 25(3), pp. 149-151 (1990). Applicants are unaware of any phosphoethanolamine derivatives of vitamin D compounds.
  • Figure 1 is a graphical representation of results from an in vitro MDA-MB-231 Human Breast Cancer Cell inhibition assay of a compound of the invention, designated CPR 2005, in comparison with vitamin D 3 .
  • Figure 2 is a graphical representation of results from an in vitro HT-29 Human
  • Colon Cancer Cells inhibition assay of a compound of the invention designated CPR 2005, in comparison with vitamin D 3 .
  • Figure 3 is a graphical representation of results from an in vitro PAM-212 Mouse Keratinocytes inhibition assay of a compound of the invention, designated CPR 2005, in comparison with vitamin D 3 .
  • the present invention relates to novel phosphoethanolamine conjugates of vitamin D compounds, natural or synthetic, as represented by the general formula (I):
  • PEA together with the oxygen, bonded to both the PEA moiety and the vitamin D moiety, is phosphoethanolamine moiety of the formula: O
  • R 1 is hydrogen or methyl, provided that at least one R' is methyl;
  • R 2 represents hydrogen, mediyl, carbonyl or halogen (F, Cl, Br, I);
  • R 3 represents hydrogen or hydroxy
  • R" represents a radical of the formula:
  • A is hydrogen or methyl
  • C and D individually, are each hydrogen, C,.j alkyl, trifluoromethyl or cyclopropyl; C and D, together with the commonly bound carbon atom, is cyclopropyl; and E is hydrogen, methyl, methoxy, halogen (F, Cl, Br, I), trifluoromethoxy or, provided that either C or D is not hydrogen, hydroxy; and
  • the formula (I) compounds may be alternatively denoted as "R-O-PEA ", a vitamin D moiety conjugated at the 3-hydroxy position with the defined phosphoethanolamine moiety, wherein R represents the vitamin D moiety and -O-PEA represents the defined phosphoethanolamine moiety.
  • R represents the vitamin D moiety
  • -O-PEA represents the defined phosphoethanolamine moiety.
  • Vitamin D for example, .vitamins D,, D 2 , D ⁇ , and D 4 .
  • trivial names for each have been reported.
  • cholecalciferol or calciol also known as vitamin D 3
  • calciferol also known as vitamin D 2
  • calcitriol also known as la, 25-dihydroxyvitaminD 3
  • la, 25-dihydroxyvitaminD 3 is chemically denoted as (l ⁇ , 30, 5Z, 7E)-9,10-secochole_ta-5,7, 10(19)- trie ⁇ e-l,3,25-triol.
  • vitamin D in the term “vitamin D compound” or “vitamin D moiety” is used in the same broad context as set forth in said reference, to wit:
  • vitamin D should be used as a general term to describe all steroids that exhibit qualitatively the biological activity of calciol. The term should be used in derived terms such as vitamin D activity, vitamin D deficiency, vitamin D antagonist. "
  • R in formula (I) is derived from the corresponding vitamin D compound having a hydroxyl (-OH) in the 3-position, including all possible stereo isomeric and geometrically isomeric forms due to the asymmetric carbon atoms and the cis or trans configuration at double-bonds inherent in the vitamin D structure.
  • Said vitamin D compounds with a hydroxy in the 3-position constitute the starting materials (A) used in preparing the subject phosphoethanolamine conjugates of vitamin D. Representative starting materials are identified in the following Table 1.
  • the invention also comprehends salts of the formula (I) compounds and all isomeric forms thereof.
  • These salts include acid addition salts, such as, for example, those made with hydrochloric, hydrobromic, nitric, sulfiiric, phosphoric, carbonic, acetic, citric or lactic acids.
  • the salts may also include those made with bases, such as, for example, sodium hydroxide, potassium hydroxide or calcium hydroxide.
  • the salts of the invention are made by conventional methods well known to the skilled.
  • the salts for therapeutic use of the formula (I) compounds are pharmaceutically acceptable salts, as understood in the art.
  • the compounds of the present invention (I) may be prepared by the one-step procedure outlined in the following Reaction Scheme.
  • the symbols R 2 , R 3 , R 4 , R 5 and PEA are as previously defined.
  • the thus-obtained compounds in the Reaction Scheme may be purified by conventional methods of the art, e.g. chromatography, recrystallization, etc.
  • the compounds of formula (I) have asymmetric carbon atoms (Cl, C3, C13, C14, C17, C20, and C25 positions in the secocholestatriene backbone) and in carbon atoms within R 4 in their structure and consequently they may exist in the form of different stereo isomeric forms (diastereomers) or racemates.
  • Substantially pure forms of each diastereomer, or of each enantiomer of a particular diastereomer may be obtained, substantially free of the others by the application of art known resolution methodologies such as, for example, by selective crystallization or column chromatography, or by starting their preparation from the appropriate isomeric precursor.
  • the compounds of formula (A) are known in the literature or are obtainable by art recognized procedures, for example, Wolfgang, J. Synform 1987, 5(2), 41-122;Wolfgang, J. Synform 1986, 4 ⁇ 3), 131-250; Wolfgang, J. Synform 1987, 5(1), 1-86; Stork, G., Hutchinson, D. , Okabe, M., Parker, D., Choonsup, R., Ribereau, F, Suzuki, T., Zebovitz, T. Pure Appl. Chem. 1992, 64(12), 1806-1812; Posner, G, Johnson, N. J. Org. Chem. 1994, 59, 7855-7861; Posner, G.
  • the phosphoethanolamine moiety (PEA) is introduced into Compound (A) by the selective reaction of the 3-hydroxyl group in Compound (A) with 2-chloro-2-oxo-l,3,2- dioxaphospholane in an inert organic aprotic solvent, such as, for example, toluene (preferred), benzene, chloroform, diethyl ether, dioxane and the like, followed by reaction with an appropriate amine N(R') 3 , to yield the desired compound (I).
  • an inert organic aprotic solvent such as, for example, toluene (preferred), benzene, chloroform, diethyl ether, dioxane and the like
  • the compounds of the subject invention (I) and pharmaceutically acceptable salts thereof are useful chemopreventative and adjuvant agents in several aspects. They are advantageously administered to ameliorate conditions associated with vitamin D deficiency, for example, rickets in children and osteomalacia in adults. In addition, they are useful for the treatment of cancerous tumors and also for treating inflammation and hyperproliferative skin diseases such as psoriasis.
  • the subject compounds may be used alone for such indications or in combination with other compatible medicaments.
  • the following testing procedure using the identified human breast and human colon carcinoma cell lines in an in vitro assay, demonstrates the marked anti-tumor (or antineoplastic) activity of the subject compounds.
  • ATC American Type Culture Collection: a. MDA-MB-231 (ATCC HTB-26): an estrogen receptor negative human breast carcinoma cell line (attachment dependent); and b. HT-29 (ATCC HTB-38): a human colon carcinoma cell line (attachment dependent).
  • DMEM Dulbecco's Modified Eagle's Medium
  • FBS Fetal Bovine Serum
  • DMEM/F12 1:1 DMEM and Ham's F-12 (DMEM/F12) plus 10% FBS.
  • Methodology a. After cell passage, count cells with a hemacytometer; b. Adjust cell concentration to approximately 5,000 cells per 100 ⁇ L; c. Pipette 100 ⁇ L cell suspension into each well of a standard 96-well microtiter plate; d. Preincubate 24 hours to allow cells to attach; e. Add test compound d ssolved in phosphate buffered saline (PBS), or in DMSO for the comparative compound, vitamin D 3 , for final concentration levels ranging from 0 to 100 ⁇ M; f. Adjust volume to 200 ⁇ L per well by adding culture media without FBS; and g. Incubate 48 hours under standard culture conditions and determine end point.
  • PBS phosphate buffered saline
  • DMSO DMSO
  • End Point a. Remove media and add 100 ⁇ L per well of cold (4°C) 10% (w/v) trichloroacetic acid (TCA) in water; b. After 1 hour at 4 C C, remove TCA and rinse cells 5 times with tap water; c. Air-dry plates; d. Add 50 ⁇ L per well of 0.4% (w/v) sulforhoda ine B (SRB) in 1 % (v/v) acetic acid in water; e. After 30 minutes at room temperature, rinse cells 4 times with 1 % (v/v) acetic acid in water to remove residual stain; f. Air-dry plates; g. Dissolve stain by adding 100 ⁇ L per well of unbuffered Tris base, pH 10.5; h. Read absorbance at 562 n using ' a standard 96-well microtiter plate reader.
  • Absorbance readings are linear with dye concentrations below 1.8 absorbance units. To reduce absorbance, decrease wavelength at which measurements are taken; i. Data Analysis: single point reading: the higher the absorbance, the higher the cell number; control - no test compound present in culture medium; background - no cell present, no test compound present in culture medium; initial control cell number (ICCN) - no test compound present in culture medium, end point was determined at the time of treatment; final control cell number (FCCN) - no test compound present in culture medium, end point was determined at 72 hours after treatment; final cell number (FCN) - test compound present in culture medium, end point was determined at 48 hours after treatment; calculate:
  • ICCN A(control, zero hour)-A(background)
  • FCCN A(control, 48 hours)-A(background)
  • FCCN - ICCN where A is absorbance
  • Results are represented in Figures 1 and 2, which illustrate the marked inhibition of MDA- MB-231 cell growth at 100 ⁇ M and HT-29 cell growth at concentrations above 30 ⁇ M by
  • Anti-tumor activity is to be expected against a wide spectrum of mammalian (including human) tumors and cancerous growths such as cancers of the oral cavity and pharynx (lip, tongue, mouth, pharynx), esophagus, stomach, small intestine, large intestine, rectum, hver and biliary passages, pancreas, larynx, lung, bone, connective tissue, skin, colon, breast, cervix, uteri, corpus endomet ⁇ um, ovary, prostate, testes, bladder, kidney and other urinary tissues, eye, brain and central nervous system, thyroid and other endocrine glands, leukemias (lymphocytic, granulacytic, monocytic), Hodgkin's disease, non-Hodgkin's lymphomas, multiple myeloma, etc.
  • tumors include cancers of the oral cavity and pharynx (lip, tongue, mouth, pharynx), e
  • the instant invention thus provides a method of treating a tumor in a mammal afflicted with same comprising administering to said mammal an effective anti-tumor amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof.
  • the invention also provides pharmaceutical compositions comprising an effective anti-tumor amount of a Formula (I) compound or such salt and a pharmaceutically acceptable carrier.
  • Psoriasis is a chronic inflammatory dermatosis characterized, in part, by hyper- proliferation of keratinocytes and release of pro-inflammatory cytokines. Compounds that reduce hype ⁇ roliferation of keratinocytes in vitro are likely to have utility in the control of psoriasis. As will be shown, using the assay described below with the illustrative compound CPR-2005, the compounds of Formula (I) markedly inhibit proliferation of these cells in vitro, thus indicating that these compounds are useful in ameliorating psoriasis.
  • Cell line PAM-212 murine keratinocyte cell line isolated and cultivated from newborn
  • mice see S. H. Yuspa et al., Cancer Research, Vol. 40, pp. 4694-4703, December, 1980) that appears to retain many characteristics of normal keratinocytes.
  • Methodology is the same as that described in part 4 of the assay protocol for anti-tumor activity, except that, with reference to part 4(b) of the assay protocol for anti-tumor activity, cell concentration in this case is adjusted to 1,000 cells per 100 ⁇ L (rather than 5,000 cells per 100 ⁇ L).
  • the instant invention thus provides a method of treating psoriasis in a mammal inflicted with same comprising administering to said mammal an effective anti-psoriatic amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof. It also provides pharmaceutical compositions comprising an effective anti-psoriatic amount of a compound of Formula (I) or such salt and a pharmaceutically acceptable carrier.
  • Inflammation is a complex process, involving a variety of cell types including macrophages, for example, see S.L. Kunkel, "Inflammatory Cytokines", pp. 1-15, in Manual of Vascular Mediators, P.A. Ward, Editor, produced by the publishers of Hospital Practice. References relative to macrophages are numerous, including, for example, J. Immunology Vol. 119, pp. 950-954
  • Macrophages are activated by infection and by a wide variety of non-infectious irritants and proinflammatory agents. Upon activation, macrophages participate in a variety of reactions. They may phagocytize bacteria and kill them by either oxygen-dependent or -independent pathways. With respect to the oxygen-dependent pathways, activation of macrophages induces them to increase oxygen consumption and produce reactive oxygen species (for example, radicals such as superoxide). Production of reactive oxygen species by activated macrophages is associated with inflammatory responses. In addition, on activation, macrophages release a variety of inflammatory cytokines, including several interleukins and tumor necrosis factor a (TNF ⁇ ). Inhibition of any of these activation-related processes can lead to reduced inflammation.
  • TNF ⁇ tumor necrosis factor a
  • the RAW 264.7 cell line (available from the ATCC under accession no. TIB 71) is a murine monocyte/macrophage line the cells of which show many of the differentiative functions of a macrophage. Like macrophages, the cells are capable of phagocytosis and undergo an oxidative burst (increased oxygen consumption) and production of oxygen radicals (e.g., superoxide) in response to appropriate signals.
  • Oxionionase oxygen radicals
  • Agents that inhibit the activation of these cells in vitro, so as to inhibit the respiratory burst and corresponding production of oxygen radicals associated with the activation are therefore inhibitors of macrophage activation and critical steps in inflammatory processes.
  • the respiratory burst and corresponding production of oxygen radicals that accompany macrophage activation can be measured in a variety of ways, including chemiluminescence based on the reaction of the oxygen radicals with luminol added to the culture medium (see M.A. Trush et al., 1978, "The Generation of Chemiluminescence by Phagocytic Cells.” Methods in Enzymology 57: 462-494). Indeed, chemiluminescence generated from luminol in the culture medium of macrophage cell lines is recognized in the art as a marker of macrophage activation.
  • EDTA (1 ⁇ M in ca-MG free Hank's balanced salt solution); at a 1:4 to 1:5 split; b. All procedures are performed aseptically in a class II biological safety cabinet using standard BL-2 containment procedures. In order to prevent genetic drift in stock cell lines, fresh cultures are prepared at approximately monthly intervals with cells thawed from liquid nitrogen storage.
  • Methodology a. After cell passage, count cells with a hemacytometer; b. Adjust cell concentration to approximately 1,000,000 cells per mL; c. Suspend cells in DMEM lacking phenol red and without FBS; d. Pipette 1 mL of cell suspension into a standard luminometer cuvet (12 x 75), commercially obtainable from Analytical Luminescence Laboratories, San Diego,
  • Results are represented in Table 1, which indicates the marked inhibition of luminescence by CPR 2005 at concentrations above 1 ⁇ M.
  • mice Male CD-I , 21-24 g (Product Number 3002) obtainable from Harlan Sprague
  • mice Dawley, Indianapolis, IN, USA; 2. Methodology: a. Prepare 0.01 % (w/v) PMA in a mixture of equal volumes of acetone and ethanol; b. Prepare 0.01% (w/v) PMA and 5% (w/v) test compound in a mixture of equal volumes of acetone and ethanol; c. Divide 9 mice into 3 groups of 3 mice each; d. Leave one group of mice untreated; e. Treat the second group of mice by applying 20 ⁇ L of PMA solution to both ears using a micropipetter; f. Treat the third group of mice by applying 20 ⁇ L of PMA solution to the right ear and 20 ⁇ L of PMA/test compound solution to the left ear; g. Wait 6 hours and euthanize the mice in a CC_ chamber h. Cut the ears and punch out circles of 6-mm diameter; and
  • Results are represented in Table 2, which shows the marked inhibition of PMA-induced inflammation in mouse ear by CPR 2005.
  • the subject compounds are useful in the treatment of acute and chronic inflammatory diseases, such as, for example, dermatitis, conjunctivitis, bursitis, rheumatoid arthritis and the like.
  • the instant invention thus provides a method of treating inflammation in a mammal afflicted with same comprising administering to said mammal an effective anti-inflammatory amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof. It also provides pha ⁇ naceuticai compositions containing an effective anti-inflammatory amount of a Formula (I) compound or such salt and a pharmaceutically acceptable carrier.
  • compositions of the present invention comprise an active compound, i.e., a Formula (I) compound or a pharmaceutically acceptable salt thereof, together with an acceptable carrier for it and optionally other therapeutically active ingredients.
  • the carrier must be pharmaceutically acceptable in the sense of being compatible with the other ingredients of the composition and not deleterious to the recipient thereof.
  • compositions include those suitable for oral, rectal or parenteral (including subcutaneous, intramuscular, intrader al and intravenous), nasal, or bronchial administration. Preferred are those suitable for oral or parenteral administration. Topical formulations are also included, for example, for anti-psoriatic usage.
  • Formula (I) compounds typically decompose on heating above 200°C. This characteristic may need to be taken into consideration in, for example, preparing tablets on a commercial scale where the heat of compression may be a factor.
  • the Formula (I) compounds are also rather insoluble in water and, accordingly, liquid formulations which account for this factor may be made according to art-recognized pharmaceutical techniques.
  • Examples of these techniques include an injection wherein the active compound is dissolved in a suitable solvent or co-solvent such as an appropriate polyethylene glycol, or a propylene glycol or the like; a sealed gelatin capsule enclosing an oily solution of the active compound; a suppository of the active compound in a conventional suppository base such as cocoa butter; or a liposome formulation, for example, the active compound and a glycerophospholipid such as phosphatidylcholine.
  • a suitable solvent or co-solvent such as an appropriate polyethylene glycol, or a propylene glycol or the like
  • a sealed gelatin capsule enclosing an oily solution of the active compound
  • a suppository of the active compound in a conventional suppository base such as cocoa butter
  • a liposome formulation for example, the active compound and a glycerophospholipid such as phosphatidylcholine.
  • the aforementioned characteristics of the Formula (I) compounds are
  • formulations may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. All methods include die step of bringing the active compound into association with a carrier which constitutes one or more accessory ingredients. In general, the formulations are prepared by uniformly and intimately bringing the active compound into association with a liquid or solid carrier and then, if necessary, shaping the product into desired unit dosage form.
  • Formulations of the present invention suitable for oral administration may be presented as discrete units sucb as capsules, cachets, tablets, boluses or lozenges, each containing a predetermined amount of the active compound; as a powder or granules; or in liquid form, e.g.
  • a tablet may be made by compression or molding, optionally with one or more accessory ingredients.
  • Compressed tablets may be prepared by compressing in a suitable machine the active compound in a free-flowing form, e.g., a powder or granules, optionally mixed with accessory ingredients, e.g., binders, lubricants, inert diluents, surface active or dispersing agents.
  • Molded tablets may be made by molding in a suitable machine, a mixture of the powdered active compound with any suitable carrier.
  • Formulations suitable for parenteral administration conveniently comprise a sterile preparation of the active compound in, for example, a polyethylene glycol 200 or propylene glycol solution which is preferably isotonic with the blood of the recipient.
  • Useful formulations also comprise concentrated solutions or solids containing the compound of Formula (I) which upon dilution with an appropriate solvent give a solution suitable for parenteral administration.
  • Preparations for topical or local applications which are, for example, conventional for anti-psoriatic usage, comprise aerosol sprays, lotions, gels, ointments, etc. and pharmaceutically acceptable vehicles therefore such as, for example, lower aliphatic alcohols, polyglycerols such as glycerol, polyethyleneglycerol, esters of fatty acids, oils and fats, silicones, and other conventional topical carriers.
  • pharmaceutically acceptable vehicles therefore such as, for example, lower aliphatic alcohols, polyglycerols such as glycerol, polyethyleneglycerol, esters of fatty acids, oils and fats, silicones, and other conventional topical carriers.
  • the compounds of Formula (I) are preferably utilized at concentrations of from about 0.1 % to about 5.0% percent by weight.
  • the formulations of this invention may further include one or more optional accessory ingredients(s) utilized in the art of pharmaceutical formulations, e.g., diluents, buffers, flavoring agents, binders, surface active agents, thickeners, lubricants, suspending agents, preservatives (including antioxidants) and the like.
  • the compounds of Formula (I) and salts thereof of the invention are intended to be administered under the guidance of a physician or veterinarian.
  • the amount of compound of Formula (I) or salt thereof required to be effective for each of the herein indicated activities will, of course, vary with the individual mammal being treated and is ultimately at the discretion of the medical or veterinary practitioner.
  • the factors to be considered include the condition being treated, the route of administration, the nature of the composition, the mammal's species and sex, the mamma s body weight, surface area, age and general condition, and the particular compound or salt to be administered.
  • the pharmaceutical compositions of this invention contain from about 0.5 to about 500 mg and, preferably, from about 5 to about 350 mg of the active ingredient, preferably in a unit dosage form, for each of the indicated activities.
  • a suitable effective dose is in the range of about 0.1 to about 200 mg/kg body weight per day, preferably in the range of about 1 to about 100 mg/kg per day, calculated as the non-salt form of Formula (I).
  • the total daily dose may be given as a single dose, multiple doses, e.g., two to six times per day, or by intravenous infusion for a selected duration Dosages above or below the range cited above are within the scope of the present invention and may be administered to the individual patient if desired and necessary.
  • a dose range would be about 7.5 to about 1500 mg per day, and a typical dose would be about 800 mg per day. If discrete multiple doses are indicated, treatment might typically be 200 mg of a compound of Formula (I) given 4 times per day.
  • Solutions of the subject compounds (I) in PBS have characteristics indicative of the presence of liposomes. These preparations require sonication in order to form uniform, cloudy suspensions. The requirement for sonication and the cloudy appearance of the suspensions are some known properties of liposomal preparations. Additionally, foam generation, which is associated with miceliar suspensions, is not a property of these preparations. Hence, unlike vitamin D 3 , the subject compounds are capable of forming liposomes.
  • Neat 4-chloro-2-oxo-l,3,2-dioxaphospholane(0.81 g, 5.72 mmol) is added in one portion to a stirred, mixture of (5Z,7E)-(3S)-9, 10-secocholesta-5,7, 10(19)-trien-3-ol (2.0 g, 5.2 mmol), commercially obtained from Spectrum Chemical Manufacturing Corp., Gardena, California, and triethylamine (0.84 mL, 5.76 mmol) in anhydrous toluene (80 mL) at room temperature under a nitrogen atmosphere. The resultant mixture is stirred at room temperature for four days. The white solid which precipitates is filtered off and washed wi ⁇ dry toluene.
  • the toluene filtrate is concentrated in vacuo to leave a viscous residue which is further dried under high vacuum. Then, a mixture of tiimethylamine (6.24 g) in acetonitrile (dried by distillation over phosphorus pentoxide, 65 mL) is added to the residue. The flask which contains the residue and tiimethylamine in acetonitrile is sealed by tightly connecting glass stoppers with wire and is then heated with stirring to 60-70°C for 24 hours. Upon cooling, a white solid precipitates. The mixture is put into a refrigerator for 24 hours to further crystallize. The white solid is filtered from the cold solution and is washed sequentially with dry acetonitrile and then acetone.
  • Example 1 The procedure of Example 1 is followed, except that an equivalent amount of each vitamin D compound in Table 1, from 2 to 7, is used as the starting material to yield, as respective products, the corresponding 3-phosphocholine derivative of formula (I):

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Abstract

Certain phosphoethanolamine conjugates of vitamin D compounds are disclosed wherein the phosphoethanolamine moiety is bonded at the 3-position of the vitamin D moiety. The conjugates exhibit anti-tumour, anti-psoriatic and anti-inflammatory activities in addition to those activities associated with vitamin D. The invention embraces the novel compounds, pharmaceutical compositions thereof, and their methods of use.

Description

PHOSPHOETHANOLAMINE CONJUGATES OF VITAMIN D COMPOUNDS
FIELD OF THE INVENTION
The present invention relates to certain phosphoethanolamine conjugates of vitamin D compounds, pharmaceutically acceptable salts thereof, and to pharmaceutical compositions thereof. In addition to activities ascribed to vitamin D itself, the novel compounds herein described possess anti-tumor, anti-psoriatic and anti-inflammatory activities.
BACKGROUND OF THE INVENTION
Amidothiophosphates and glyceroamidothiophosphate derivatives of vitamin D3 are known: S.D. Stamatov and S. Gronowitz, Lipids Vol. 25(3), pp. 149-151 (1990). Applicants are unaware of any phosphoethanolamine derivatives of vitamin D compounds.
It is known that sulfonylation will occur preferentially at the 3-hydroxy position when additional hydroxy groups are present at the 1, 24 or 25 positions of vitamin D derivatives: A. Kutner et al., Bioorganic Chemistry, Vol. 14, p. 134 (1986). This preferential occurrence is advantageously utilized in the analogous phosphorylation reaction hereinafter described to make the subject compounds.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a graphical representation of results from an in vitro MDA-MB-231 Human Breast Cancer Cell inhibition assay of a compound of the invention, designated CPR 2005, in comparison with vitamin D3. Figure 2 is a graphical representation of results from an in vitro HT-29 Human
Colon Cancer Cells inhibition assay of a compound of the invention, designated CPR 2005, in comparison with vitamin D3.
Figure 3 is a graphical representation of results from an in vitro PAM-212 Mouse Keratinocytes inhibition assay of a compound of the invention, designated CPR 2005, in comparison with vitamin D3.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to novel phosphoethanolamine conjugates of vitamin D compounds, natural or synthetic, as represented by the general formula (I):
Figure imgf000004_0001
R'
wherein:
PEA, together with the oxygen, bonded to both the PEA moiety and the vitamin D moiety, is phosphoethanolamine moiety of the formula: O
O CH, CH, N+(R')3
and wherein:
R1 is hydrogen or methyl, provided that at least one R' is methyl;
R2 represents hydrogen, mediyl, carbonyl or halogen (F, Cl, Br, I);
R3 represents hydrogen or hydroxy;
R" represents a radical of the formula:
T ^o wherein:
A is hydrogen or methyl;
B is -CH2-, -CHJCHJ-, -CH2CH2CH2-, -OCH , -OCH-CH--, -OCH2CH2CH2-, -CHjOCH,-, -CH2OCH2CH , -CH2OCH2CH2CH2-, -CF2-, -CF2CF2-, -CF-CFjCI , -CH=CH-, -CsC-, -CH2CH=CH-, -CH2CH2CH=CH-,
-CH=CHCH , -CH=CHCH2CH2-, -CH2CaC-, -CH=CH-CH=CH-, -CH=CH-CH=CH-CH=CH-, or -CH=CH-CH(CH3)-; C and D, individually, are each hydrogen, C,.j alkyl, trifluoromethyl or cyclopropyl; C and D, together with the commonly bound carbon atom, is cyclopropyl; and E is hydrogen, methyl, methoxy, halogen (F, Cl, Br, I), trifluoromethoxy or, provided that either C or D is not hydrogen, hydroxy; and
R5 represents hydrogen, methyl, ethyl, halogen, vinyl, phenyl and halomethyl (halo = F, Cl, Br, I).
The formula (I) compounds may be alternatively denoted as "R-O-PEA ", a vitamin D moiety conjugated at the 3-hydroxy position with the defined phosphoethanolamine moiety, wherein R represents the vitamin D moiety and -O-PEA represents the defined phosphoethanolamine moiety. As known in the literature, there are several forms of Vitamin D, for example, .vitamins D,, D2, D}, and D4. In addition to the chemical name for each form, trivial names for each have been reported. For example, cholecalciferol or calciol, also known as vitamin D3, is chemically denoted as 9,10-secocholesta-5,7,10(19)-trien-3-ol; calciferol, also known as vitamin D2, is chemically denoted as 9,10-secoergosta-5,7,10(19), 22-tetraen-3-ol; and calcitriol, also known as la, 25-dihydroxyvitaminD3, is chemically denoted as (lα, 30, 5Z, 7E)-9,10-secochole_ta-5,7, 10(19)- trieπe-l,3,25-triol. As a result, attempts have been made by scientific entities to standardize the nomenclature; example, see "Nomenclature of Vitamin D", Pure & Appl. Chem., Vol. 54, No. 8, pp.
1511-1516, 1982. For purposes of this invention, "vitamin D" in the term "vitamin D compound" or "vitamin D moiety" is used in the same broad context as set forth in said reference, to wit:
"The term vitamin D should be used as a general term to describe all steroids that exhibit qualitatively the biological activity of calciol. The term should be used in derived terms such as vitamin D activity, vitamin D deficiency, vitamin D antagonist. "
The moiety represented by R in formula (I) is derived from the corresponding vitamin D compound having a hydroxyl (-OH) in the 3-position, including all possible stereo isomeric and geometrically isomeric forms due to the asymmetric carbon atoms and the cis or trans configuration at double-bonds inherent in the vitamin D structure. Said vitamin D compounds with a hydroxy in the 3-position constitute the starting materials (A) used in preparing the subject phosphoethanolamine conjugates of vitamin D. Representative starting materials are identified in the following Table 1.
TABLE 1
Figure imgf000006_0001
Figure imgf000006_0002
Reference 1: Wolfgang, J. Synform 1985, Vol. 3(2), pp. 41-212 and references cited therein. Compound 1: (5Z,7E)-9,10-Seco-5,7, 10(19)-cholestatrien-3-ol, also denoted herein as CPR 2005, see Example 1. Reference 2: Wolfgang, J. Synform 1987, Vol. 5(1), pp. 1-86 and references cited therein.
Compound 2: (5Z,7E)-(3S)-9, lO-Seco-5,7, 10(19)-cholestatriene-3,25-diol.
Reference 3: Stork, G.; Hutchinson, D.; Okabe, M.; Parker, D.; Ra, C; Ribereau, F.; Suzuki,
T.; Zebovitz, T. Pure Appl Chan. 1992, Vol. 64(12), pp. 1809-1812. Compound 3: (5Z,7EHlS,3R)-9,10-Seco-5,7,10(19)-choIestatriene-l,3,25-triol. Reference 4: Wolfgang, J. Synform 1985, Vol. 3(2), pp. 41-122 and references cited therein. Compound 4: (5Z,7E,22E)-(3S)-9, 10-Seco-5,7, 10(19),22-ergostatetraen-3-ol. Reference 5: Calverly, M.J. Tetrahedron 1987, Vol. 43, pp. 4609-4619. Compound 5: (5Z,7E,22E,24S)-(lR,3S)-24-Cyclopropyl-9, 10-secochola-5,7,10(19),22-tetraene-l,3,
24-triol. Reference 6: Murayama, E.; iyamoto.H.; Kubodera,N.; Mori, T.; Matsunaga, I. Chem. Pharm.
Bull 1986, Vol. 34 (10), pp. 4410-4413. Compound 6: (20R)-(4-Ethyl-4-hydroxyhexyloxy)-(lS,3R)-dihydroxy-9, 10-secopregna-5(Z), 7(E),
10(19)-triene. Reference 7: Binderup, E.; Calverly, M.J. (1991) PCT Pat. Appl. No. WO91/00855. Compound 7: (20R)-(5-Ethyl-5-hydroxyhepta-l,3-dienyl)-(lS,3R)-dihydroxy-9, 10-secoρregna-(5Z),(
7E), 10(19)-triene.
Due to the presence of the phosphoethanolamine moiety (-O-PEA), the invention also comprehends salts of the formula (I) compounds and all isomeric forms thereof. These salts include acid addition salts, such as, for example, those made with hydrochloric, hydrobromic, nitric, sulfiiric, phosphoric, carbonic, acetic, citric or lactic acids. The salts may also include those made with bases, such as, for example, sodium hydroxide, potassium hydroxide or calcium hydroxide. The salts of the invention are made by conventional methods well known to the skilled. The salts for therapeutic use of the formula (I) compounds are pharmaceutically acceptable salts, as understood in the art.
I. CHEMISTRY
The compounds of the present invention (I) may be prepared by the one-step procedure outlined in the following Reaction Scheme. As used in the Reaction Scheme, the symbols R2, R3, R4, R5 and PEA are as previously defined. The thus-obtained compounds in the Reaction Scheme may be purified by conventional methods of the art, e.g. chromatography, recrystallization, etc.
The compounds of formula (I) have asymmetric carbon atoms (Cl, C3, C13, C14, C17, C20, and C25 positions in the secocholestatriene backbone) and in carbon atoms within R4 in their structure and consequently they may exist in the form of different stereo isomeric forms (diastereomers) or racemates. Substantially pure forms of each diastereomer, or of each enantiomer of a particular diastereomer, may be obtained, substantially free of the others by the application of art known resolution methodologies such as, for example, by selective crystallization or column chromatography, or by starting their preparation from the appropriate isomeric precursor.
In addition, cis and trans geometric isomers, when a double bond is present in the B portion of R\ may also be present in the subject compounds. Thus, by starting with the appropriate cis or trans precursor, the corresponding end product of formula (I) will be obtained.
All isomeric forms (i.e., stereo isomeric and geometrically isomeric forms and mixtures thereof) of the compounds of formula (I) are intended to be within the scope of this invention.
Working up the individual products indicated in the Reaction Scheme is advantageously carried out by standard methodologies, for example, by evaporating down the reaction solution or precipitating the product from the reaction solution by dilution with appropriate antisolvents. Particularly suitable methods for purifying the formula (I) compounds are the conventional chromatographic methods, such as preparative thin-layer chromatography (TLC), column chromatography, adsorption chromatography, medium pressure liquid chromatography (MPLC) or high pressure liquid chromatography (HPLC).
Figure imgf000008_0001
(A) CD
Step 1:
The compounds of formula (A) are known in the literature or are obtainable by art recognized procedures, for example, Wolfgang, J. Synform 1987, 5(2), 41-122;Wolfgang, J. Synform 1986, 4{3), 131-250; Wolfgang, J. Synform 1987, 5(1), 1-86; Stork, G., Hutchinson, D. , Okabe, M., Parker, D., Choonsup, R., Ribereau, F, Suzuki, T., Zebovitz, T. Pure Appl. Chem. 1992, 64(12), 1806-1812; Posner, G, Johnson, N. J. Org. Chem. 1994, 59, 7855-7861; Posner, G. , Dai, H., Afarinkia, K-, Murthy, N.; Guyton, K. , Kensler, T. J. Org. Chem. 1993, 58, 7209-7215; Calverly, M.J. Trends Med. Chem. '90, Proc Int. Symp. Med. Chem. , 11th 1992, 299-306 and references cited therein. Deluca, H.F.; Schnoes, H.K.; Perlman, K.L.; Kutner, A. Brit. UK Pat. Appl. GB 2,217,715 (01 Nov 1989), US Pat. Appl. 187,680 (29 Apr 1988); Deluca, H.F.; Schnoes, H.K.; Perlman, K.L. Brit. UK Pat. Appl GB 2,217,716 (01 Nov 1989, US PaL Appl. 187,675 (29 Apr 1988); Schoenecker, B., Reichenbaecher, M., Gliesling, S. Ger. Offen. DE 4,334,154 (06 Apr 1995);
Taguchi, T.; Mitsuhashi, S.; Yamanouchi, A.; Kobayashi, Y.; Sai, H.; D ekawa, N. Tetrahedron Lett. 1984, 25(43), 4933-4936; Calverly, M. J. Tetrahedron, 1987, 43(20), 4609-4619; Norman, A.W.; Bouillon, R.; Thomasset, M. (Eds) Proc. Workshop Vuam. D 1991, 8th (Vitam. D), 127-217 and references cited therein; Norman, A.W.; Schaefer, K.; Grigoleit, H.G.; Herrath, D.V. (Eds) Proc. Workshop Vitam. D 1988, 7th (Vitam. D), 1-78 and references cited therein.
The phosphoethanolamine moiety (PEA) is introduced into Compound (A) by the selective reaction of the 3-hydroxyl group in Compound (A) with 2-chloro-2-oxo-l,3,2- dioxaphospholane in an inert organic aprotic solvent, such as, for example, toluene (preferred), benzene, chloroform, diethyl ether, dioxane and the like, followed by reaction with an appropriate amine N(R')3, to yield the desired compound (I).
H. UTILITY
The compounds of the subject invention (I) and pharmaceutically acceptable salts thereof are useful chemopreventative and adjuvant agents in several aspects. They are advantageously administered to ameliorate conditions associated with vitamin D deficiency, for example, rickets in children and osteomalacia in adults. In addition, they are useful for the treatment of cancerous tumors and also for treating inflammation and hyperproliferative skin diseases such as psoriasis. The subject compounds may be used alone for such indications or in combination with other compatible medicaments.
A. ANTI-TUMOR
The following testing procedure, using the identified human breast and human colon carcinoma cell lines in an in vitro assay, demonstrates the marked anti-tumor (or antineoplastic) activity of the subject compounds.
Assay
1. Human tumor cell lines, obtainable from the American Type Culture Collection
(ATCC): a. MDA-MB-231 (ATCC HTB-26): an estrogen receptor negative human breast carcinoma cell line (attachment dependent); and b. HT-29 (ATCC HTB-38): a human colon carcinoma cell line (attachment dependent).
2. Culture media: a. For cell line 1-a: Dulbecco's Modified Eagle's Medium (DMEM) plus 1055 Fetal Bovine Serum (FBS); and b. For cell line 1-b: 1:1 DMEM and Ham's F-12 (DMEM/F12) plus 10% FBS.
3. Standard protocol for culturing cell lines: in T-75 or T-150 flasks; 37°C; 95% air, 5% CC^;
100% humidity; a. Cell lines are passaged when approximately 80% confluent; with trypsin (1 mg/ml) and EDTA (1 μM in ca-MG free Hank's balanced salt solution); at a 1:4 to 1:5 split; b. All procedures are performed aseptically in a class II biological safety cabinet using standard BL-2 containment procedures. In order to prevent genetic drift in stock cell lines, fresh cultures are prepared at approximately monthly intervals with cells thawed from liquid nitrogen storage.
4. Methodology: a. After cell passage, count cells with a hemacytometer; b. Adjust cell concentration to approximately 5,000 cells per 100 μL; c. Pipette 100 μL cell suspension into each well of a standard 96-well microtiter plate; d. Preincubate 24 hours to allow cells to attach; e. Add test compound d ssolved in phosphate buffered saline (PBS), or in DMSO for the comparative compound, vitamin D3, for final concentration levels ranging from 0 to 100 μM; f. Adjust volume to 200 μL per well by adding culture media without FBS; and g. Incubate 48 hours under standard culture conditions and determine end point.
5. End Point: a. Remove media and add 100 μL per well of cold (4°C) 10% (w/v) trichloroacetic acid (TCA) in water; b. After 1 hour at 4CC, remove TCA and rinse cells 5 times with tap water; c. Air-dry plates; d. Add 50 μL per well of 0.4% (w/v) sulforhoda ine B (SRB) in 1 % (v/v) acetic acid in water; e. After 30 minutes at room temperature, rinse cells 4 times with 1 % (v/v) acetic acid in water to remove residual stain; f. Air-dry plates; g. Dissolve stain by adding 100 μL per well of unbuffered Tris base, pH 10.5; h. Read absorbance at 562 n using' a standard 96-well microtiter plate reader.
Absorbance readings are linear with dye concentrations below 1.8 absorbance units. To reduce absorbance, decrease wavelength at which measurements are taken; i. Data Analysis: single point reading: the higher the absorbance, the higher the cell number; control - no test compound present in culture medium; background - no cell present, no test compound present in culture medium; initial control cell number (ICCN) - no test compound present in culture medium, end point was determined at the time of treatment; final control cell number (FCCN) - no test compound present in culture medium, end point was determined at 72 hours after treatment; final cell number (FCN) - test compound present in culture medium, end point was determined at 48 hours after treatment; calculate:
ICCN=A(control, zero hour)-A(background) FCCN=A(control, 48 hours)-A(background)
FCN=A(test compound, 48 hours)-A(background)
% Relative Increase in Cell Number = FCN - ICCN X 100
FCCN - ICCN where A is absorbance.
6. Results are represented in Figures 1 and 2, which illustrate the marked inhibition of MDA- MB-231 cell growth at 100 μM and HT-29 cell growth at concentrations above 30 μM by
CPR 2005.
From the foregoing assay results, it is evident that the Formula (I) compounds demonstrate marked anti-tumor or anti-cancer activity, particularly against human breast and human colon carcinomas, as illustrated by the compound CPR-2005.
Anti-tumor activity is to be expected against a wide spectrum of mammalian (including human) tumors and cancerous growths such as cancers of the oral cavity and pharynx (lip, tongue, mouth, pharynx), esophagus, stomach, small intestine, large intestine, rectum, hver and biliary passages, pancreas, larynx, lung, bone, connective tissue, skin, colon, breast, cervix, uteri, corpus endometπum, ovary, prostate, testes, bladder, kidney and other urinary tissues, eye, brain and central nervous system, thyroid and other endocrine glands, leukemias (lymphocytic, granulacytic, monocytic), Hodgkin's disease, non-Hodgkin's lymphomas, multiple myeloma, etc. Herein the terms "tumor", "cancer" and "cancerous growths" are used synonymously.
The instant invention thus provides a method of treating a tumor in a mammal afflicted with same comprising administering to said mammal an effective anti-tumor amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof. The invention also provides pharmaceutical compositions comprising an effective anti-tumor amount of a Formula (I) compound or such salt and a pharmaceutically acceptable carrier.
B. ANTI-PSORIASIS
Psoriasis is a chronic inflammatory dermatosis characterized, in part, by hyper- proliferation of keratinocytes and release of pro-inflammatory cytokines. Compounds that reduce hypeφroliferation of keratinocytes in vitro are likely to have utility in the control of psoriasis. As will be shown, using the assay described below with the illustrative compound CPR-2005, the compounds of Formula (I) markedly inhibit proliferation of these cells in vitro, thus indicating that these compounds are useful in ameliorating psoriasis.
Assay
1. Cell line: PAM-212 murine keratinocyte cell line isolated and cultivated from newborn
BALB/c mice (see S. H. Yuspa et al., Cancer Research, Vol. 40, pp. 4694-4703, December, 1980) that appears to retain many characteristics of normal keratinocytes.
2. Culture medium: 1:1 DMEM and Ham's F-12 with 10% FBS.
3. Culture conditions are the same as those described in part 3 of the assay protocol for anti- tumor activity.
4. Methodology is the same as that described in part 4 of the assay protocol for anti-tumor activity, except that, with reference to part 4(b) of the assay protocol for anti-tumor activity, cell concentration in this case is adjusted to 1,000 cells per 100 μL (rather than 5,000 cells per 100 μL).
5. End point determination and analysis are as described in part 5 of the assay protocol for anti-tumor activity. 6. Results are represented in Figure 3, which illustrates the marked inhibition of keratinocyte proliferation, and consequently anti-psoriatic activity, at concentrations above 30 μM by CPR 2005.
The instant invention thus provides a method of treating psoriasis in a mammal inflicted with same comprising administering to said mammal an effective anti-psoriatic amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof. It also provides pharmaceutical compositions comprising an effective anti-psoriatic amount of a compound of Formula (I) or such salt and a pharmaceutically acceptable carrier.
C. ANTI-INFLAMMATORY
Inflammation is a complex process, involving a variety of cell types including macrophages, for example, see S.L. Kunkel, "Inflammatory Cytokines", pp. 1-15, in Manual of Vascular Mediators, P.A. Ward, Editor, produced by the publishers of Hospital Practice. References relative to macrophages are numerous, including, for example, J. Immunology Vol. 119, pp. 950-954
(1977) and Cell Vol. 15, pp. 261-267 (1978).
Macrophages are activated by infection and by a wide variety of non-infectious irritants and proinflammatory agents. Upon activation, macrophages participate in a variety of reactions. They may phagocytize bacteria and kill them by either oxygen-dependent or -independent pathways. With respect to the oxygen-dependent pathways, activation of macrophages induces them to increase oxygen consumption and produce reactive oxygen species (for example, radicals such as superoxide). Production of reactive oxygen species by activated macrophages is associated with inflammatory responses. In addition, on activation, macrophages release a variety of inflammatory cytokines, including several interleukins and tumor necrosis factor a (TNFα). Inhibition of any of these activation-related processes can lead to reduced inflammation.
For these reasons, macrophage activation is of critical importance in studies of the inflammatory process. Agents that reduce macrophage activation are likely to have utility as anti-inflammatory agents. As will be shown, using the assay described below with the illustrative compound
CPR 2005, the compounds of Formula (I) markedly reduce macrophage activation, thus indicating that these compounds are useful in ameliorating inflammation.
Assay for Anti-inflammatory Activity by Inhibition of Macrophage Chemiluminescence
The RAW 264.7 cell line (available from the ATCC under accession no. TIB 71) is a murine monocyte/macrophage line the cells of which show many of the differentiative functions of a macrophage. Like macrophages, the cells are capable of phagocytosis and undergo an oxidative burst (increased oxygen consumption) and production of oxygen radicals (e.g., superoxide) in response to appropriate signals. Agents that inhibit the activation of these cells in vitro, so as to inhibit the respiratory burst and corresponding production of oxygen radicals associated with the activation, are therefore inhibitors of macrophage activation and critical steps in inflammatory processes. The respiratory burst and corresponding production of oxygen radicals that accompany macrophage activation can be measured in a variety of ways, including chemiluminescence based on the reaction of the oxygen radicals with luminol added to the culture medium (see M.A. Trush et al., 1978, "The Generation of Chemiluminescence by Phagocytic Cells." Methods in Enzymology 57: 462-494). Indeed, chemiluminescence generated from luminol in the culture medium of macrophage cell lines is recognized in the art as a marker of macrophage activation.
1. Cell line: Raw 264.7 (ATCC TIB-71, attachment dependent);
2. Culture medium: DMEM with 10% FBS;
3. Standard protocol for culturing cell lines: in T-75 or T-150 flasks; 37°C; 95% air, 5% C02; 100% humidity; a. Cell line is passaged when approximately 80% confluent; with trypsin (1 mg/ml) and
EDTA (1 μM in ca-MG free Hank's balanced salt solution); at a 1:4 to 1:5 split; b. All procedures are performed aseptically in a class II biological safety cabinet using standard BL-2 containment procedures. In order to prevent genetic drift in stock cell lines, fresh cultures are prepared at approximately monthly intervals with cells thawed from liquid nitrogen storage.
4. Methodology: a. After cell passage, count cells with a hemacytometer; b. Adjust cell concentration to approximately 1,000,000 cells per mL; c. Suspend cells in DMEM lacking phenol red and without FBS; d. Pipette 1 mL of cell suspension into a standard luminometer cuvet (12 x 75), commercially obtainable from Analytical Luminescence Laboratories, San Diego,
California, USA; e. Add luminol to final concentration of 0.2 μM; f. Add test compound dissolved in phosphate buffered saline (PBS), or in DMSO for the comparative compound, vitamin D3, for final concentration levels ranging from 0 to 30 μM; g. Add 100 nanograms of phorbol myπstate acetate (PMA); and h. Wait 1 minute and read photo counts (i.e., luminescence) on a Monolight 2010 luminometer available from Analytical Luminescence Laboratories, San Diego. Data Analysis:
Background - no test compound present; no PMA present; Control - no test compound present; Calculate:
% Inhibition = (1 L(test compound) - I/background) ) X 100 L(control) - L(backgrouud) where L is luminescence.
Results are represented in Table 1, which indicates the marked inhibition of luminescence by CPR 2005 at concentrations above 1 μM.
Table 1
Inhibition of Respiratory Burst PMA-Stimulated Mouse Macrophages
% Inhibition
Concentration (μM) CPR 2005 Vitamin D3
30 99 12
10 98 2
3 90 9
1 45 10
In Vivo Assay
A common in vivo model for the evaluation of anti-inflammatory agents is PMA-induced inflammation in mouse ears. This method is described in "Pharmacological Methods in the Control of Inflammation", Joseph Y. Chang and Alan J. Lewis (eds), Alan R. Liss, Inc., New York, pp 221-223. In this assay, edema, which is a characteristic of inflammation, is quantified by determining ear thickness or ear weight approximately 6 hours after applying PMA to the ear.
1. Mice: Male CD-I , 21-24 g (Product Number 3002) obtainable from Harlan Sprague
Dawley, Indianapolis, IN, USA; 2. Methodology: a. Prepare 0.01 % (w/v) PMA in a mixture of equal volumes of acetone and ethanol; b. Prepare 0.01% (w/v) PMA and 5% (w/v) test compound in a mixture of equal volumes of acetone and ethanol; c. Divide 9 mice into 3 groups of 3 mice each; d. Leave one group of mice untreated; e. Treat the second group of mice by applying 20 μL of PMA solution to both ears using a micropipetter; f. Treat the third group of mice by applying 20 μL of PMA solution to the right ear and 20 μL of PMA/test compound solution to the left ear; g. Wait 6 hours and euthanize the mice in a CC_ chamber h. Cut the ears and punch out circles of 6-mm diameter; and
I. Measure the weight of three appropriate ear punches in the same group together.
Results are represented in Table 2, which shows the marked inhibition of PMA-induced inflammation in mouse ear by CPR 2005.
Table 2
PMA-Induced Inflammation in Ears of CD-I Mice
Figure imgf000016_0001
In view of their anti-inflammatory activity, the subject compounds are useful in the treatment of acute and chronic inflammatory diseases, such as, for example, dermatitis, conjunctivitis, bursitis, rheumatoid arthritis and the like.
The instant invention thus provides a method of treating inflammation in a mammal afflicted with same comprising administering to said mammal an effective anti-inflammatory amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof. It also provides phaπnaceuticai compositions containing an effective anti-inflammatory amount of a Formula (I) compound or such salt and a pharmaceutically acceptable carrier.
m. PHARMACEUTICAL COMPOSITIONS
Pharmaceutical compositions of the present invention, comprise an active compound, i.e., a Formula (I) compound or a pharmaceutically acceptable salt thereof, together with an acceptable carrier for it and optionally other therapeutically active ingredients. The carrier must be pharmaceutically acceptable in the sense of being compatible with the other ingredients of the composition and not deleterious to the recipient thereof.
The compositions include those suitable for oral, rectal or parenteral (including subcutaneous, intramuscular, intrader al and intravenous), nasal, or bronchial administration. Preferred are those suitable for oral or parenteral administration. Topical formulations are also included, for example, for anti-psoriatic usage.
It is noted that the Formula (I) compounds typically decompose on heating above 200°C. This characteristic may need to be taken into consideration in, for example, preparing tablets on a commercial scale where the heat of compression may be a factor. The Formula (I) compounds are also rather insoluble in water and, accordingly, liquid formulations which account for this factor may be made according to art-recognized pharmaceutical techniques. Examples of these techniques include an injection wherein the active compound is dissolved in a suitable solvent or co-solvent such as an appropriate polyethylene glycol, or a propylene glycol or the like; a sealed gelatin capsule enclosing an oily solution of the active compound; a suppository of the active compound in a conventional suppository base such as cocoa butter; or a liposome formulation, for example, the active compound and a glycerophospholipid such as phosphatidylcholine. In any event, the aforementioned characteristics of the Formula (I) compounds are not uncommon in the pharmaceutical area and, accordingly, art-recognized pharmaceutical techniques are employed to prepare appropriate formulations for such compounds as those of Formula (I) or pharmaceutically acceptable salts thereof. The formulations may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. All methods include die step of bringing the active compound into association with a carrier which constitutes one or more accessory ingredients. In general, the formulations are prepared by uniformly and intimately bringing the active compound into association with a liquid or solid carrier and then, if necessary, shaping the product into desired unit dosage form. Formulations of the present invention suitable for oral administration may be presented as discrete units sucb as capsules, cachets, tablets, boluses or lozenges, each containing a predetermined amount of the active compound; as a powder or granules; or in liquid form, e.g. , as suspension, solution, syrup, elixir, emulsion, dispersion, or the like. A tablet may be made by compression or molding, optionally with one or more accessory ingredients. Compressed tablets may be prepared by compressing in a suitable machine the active compound in a free-flowing form, e.g., a powder or granules, optionally mixed with accessory ingredients, e.g., binders, lubricants, inert diluents, surface active or dispersing agents. Molded tablets may be made by molding in a suitable machine, a mixture of the powdered active compound with any suitable carrier.
Formulations suitable for parenteral administration conveniently comprise a sterile preparation of the active compound in, for example, a polyethylene glycol 200 or propylene glycol solution which is preferably isotonic with the blood of the recipient. Useful formulations also comprise concentrated solutions or solids containing the compound of Formula (I) which upon dilution with an appropriate solvent give a solution suitable for parenteral administration.
Preparations for topical or local applications, which are, for example, conventional for anti-psoriatic usage, comprise aerosol sprays, lotions, gels, ointments, etc. and pharmaceutically acceptable vehicles therefore such as, for example, lower aliphatic alcohols, polyglycerols such as glycerol, polyethyleneglycerol, esters of fatty acids, oils and fats, silicones, and other conventional topical carriers.
In topical formulations, the compounds of Formula (I) are preferably utilized at concentrations of from about 0.1 % to about 5.0% percent by weight. lu addition to the aforementioned ingredients, the formulations of this invention may further include one or more optional accessory ingredients(s) utilized in the art of pharmaceutical formulations, e.g., diluents, buffers, flavoring agents, binders, surface active agents, thickeners, lubricants, suspending agents, preservatives (including antioxidants) and the like.
The compounds of Formula (I) and salts thereof of the invention are intended to be administered under the guidance of a physician or veterinarian.
The amount of compound of Formula (I) or salt thereof required to be effective for each of the herein indicated activities will, of course, vary with the individual mammal being treated and is ultimately at the discretion of the medical or veterinary practitioner. The factors to be considered include the condition being treated, the route of administration, the nature of the composition, the mammal's species and sex, the mamma s body weight, surface area, age and general condition, and the particular compound or salt to be administered. In general, the pharmaceutical compositions of this invention contain from about 0.5 to about 500 mg and, preferably, from about 5 to about 350 mg of the active ingredient, preferably in a unit dosage form, for each of the indicated activities. A suitable effective dose is in the range of about 0.1 to about 200 mg/kg body weight per day, preferably in the range of about 1 to about 100 mg/kg per day, calculated as the non-salt form of Formula (I). The total daily dose may be given as a single dose, multiple doses, e.g., two to six times per day, or by intravenous infusion for a selected duration Dosages above or below the range cited above are within the scope of the present invention and may be administered to the individual patient if desired and necessary.
For example, for a 75 kg mammal, a dose range would be about 7.5 to about 1500 mg per day, and a typical dose would be about 800 mg per day. If discrete multiple doses are indicated, treatment might typically be 200 mg of a compound of Formula (I) given 4 times per day.
Solutions of the subject compounds (I) in PBS have characteristics indicative of the presence of liposomes. These preparations require sonication in order to form uniform, cloudy suspensions. The requirement for sonication and the cloudy appearance of the suspensions are some known properties of liposomal preparations. Additionally, foam generation, which is associated with miceliar suspensions, is not a property of these preparations. Hence, unlike vitamin D3, the subject compounds are capable of forming liposomes.
The following examples are intended to illustrate and not to limit the scope of the present invention.
EXAMPLE 1
(5Z,7E)-(3S)-9,10-Secocholesta-5,7, 10(19)-trien-3-phosphocholine (CPR 2005).
Neat 4-chloro-2-oxo-l,3,2-dioxaphospholane(0.81 g, 5.72 mmol) is added in one portion to a stirred, mixture of (5Z,7E)-(3S)-9, 10-secocholesta-5,7, 10(19)-trien-3-ol (2.0 g, 5.2 mmol), commercially obtained from Spectrum Chemical Manufacturing Corp., Gardena, California, and triethylamine (0.84 mL, 5.76 mmol) in anhydrous toluene (80 mL) at room temperature under a nitrogen atmosphere. The resultant mixture is stirred at room temperature for four days. The white solid which precipitates is filtered off and washed wiώ dry toluene. The toluene filtrate is concentrated in vacuo to leave a viscous residue which is further dried under high vacuum. Then, a mixture of tiimethylamine (6.24 g) in acetonitrile (dried by distillation over phosphorus pentoxide, 65 mL) is added to the residue. The flask which contains the residue and tiimethylamine in acetonitrile is sealed by tightly connecting glass stoppers with wire and is then heated with stirring to 60-70°C for 24 hours. Upon cooling, a white solid precipitates. The mixture is put into a refrigerator for 24 hours to further crystallize. The white solid is filtered from the cold solution and is washed sequentially with dry acetonitrile and then acetone. The product, (5Z,7E)-(3S)-9, 10-secocholesta-5,7, 10(19)-trien- 3-phosρhocholine, is purified by column chromatography on silica gel using 70:25:5 CHC13-CH3OH-30 % aqueous ammonia as the eluent. Recrystallization from ethanol-acetone followed by drying in vacuo gives 0.762 g (28.7 % yield) of (5Z,7E)-(3S)-9, 10-secocholesta-5,7, 10(19)-trien- 3-phosρhocholine. TLC (silica gel 60): 65:35:5 CHC13-CH3OH-30% aqueous ammonia; Rf = 0.47. EXAMPLE 2
The procedure of Example 1 is followed, except that an equivalent amount of each vitamin D compound in Table 1, from 2 to 7, is used as the starting material to yield, as respective products, the corresponding 3-phosphocholine derivative of formula (I):
COMPOUND
2 (5Z,7E)-(3S)-9,10-Seco-5,7,10(19)-cholestatriene-25-ol-3-phosphocholine;
3 (5Z,7E)-(lS,3R)-9, 10-Seco-5,7, 10(19)-cholestatriene-l,25-diol-3-phosphocholine;
4 (5Z,7E,22E)-(3S)-9, 10-Seco-5,7, 10(19),22-ergos tetraen-3-phosphocholine;
5 (5Z,7E,22E,24S)-(lR,3S)-24-Cyclopropyl-9,10-secochola-5,7,10(19),22-tetraene-l,24-diol-3- phosphocholine;
6 (20RH4-Ethyl-4-hydroxyhexyloxy)-(lS)-hydroxy-9, 10-secopregna-5(Z), 7(E), 10(19)-triene-(3R)-phosphocholine; and
7 (20R)-(5-Ethyl-5-hydroxyhepta- 1 , 3 -dieny l)-( 1 S)-hydroxy-9 , 10-secopregna-(5Z) , (7E) , 10(19)-triene-(3R)-phosphocholine.
EXAMPLE 3
By following the procedure of Example 1, except that an equivalent amount of the appropriate amine N(Rl)3 is substituted for the trimethylamine used therein, the following are obtained as respective products;
(5Z,7E)-(3S)-9, lO-secocholesta-5,7, 10(19)-triene-3-phospho-(N-methyl)-ethanolamine; and (5Z,7E)-(3S)-9,10-secocholesta-5,7, 10(19)-triene-3-phospho-(N,N-dimethyl)-ethanolamine.
EXAMPLE 4
Tablets
This is an illustrative example of tablets containing the following ingredients which may be prepared in conventional manner. Ingredient Per Tablet (mg) CPR-2005 50-100 Lactose 70 Maize Starch 70 Polyvinylpyrrolidone 5 Magnesium stearate 5 Tablet Weight 200-250
Oil-in-Water Cream Base Formulation:
This is an illustrative example of oil-in-water cream base formulation for topical use that may be prepared in a conventional manner using a Formula (I) compound as the active ingredient.
Ingredient Weight (g) Active ingredient 10.0 Anhydrous lanolin 20.0 Polysorbate 60 4.0 Sorbitan monopalmitate 2.0 Light liquid paraffin 4.0 Propylene glycol 5.0 Methyl hydroxybenzoate 0.1 Purified water To 100.0
Capsules:
This is an illustrative example of capsules containing the following ingredients which may be prepared in a conventional manner: In gradient Per Capsule ( g) CPR-2005 50 Lactose 450
Magnesium Stearate 5 Capsule Weight 505

Claims

ClaimsWhat is claimed is:
1. A conjugate of a vitamin D moiety characterized by a phosphoethanolamine moiety of formula:
O
-O-P-O-CH2-CH2-N(Ri) 3 O"
at the 3-position of the vitamin D moiety, wherein R1 is hydrogen or methyl, provided that at least one R1 is methyl, all isomeric forms of the conjugate, pharmaceutically-acceptable salts of the conjugate, and all isomeric forms thereof.
2. A conjugate of Claim 1 of the formula:
Figure imgf000023_0001
wherein -O-PEA is a phosphoethanolamine of the formula:
Figure imgf000024_0001
wherein:
R1 is hydrogen or methyl, provided that at least one R1 is methyl;
R2 is hydrogen, methyl, carbonyl, or halogen;
R3 is hydrogen or hydroxy;
R4 is a radical of formula:
Figure imgf000024_0002
wherein:
A is hydrogen or methyl;
B is -CH-, -CH2CH2-, -CH2CH2CH , -OCH2-, -0CH2CH2-, -OCH2CH2CH2-, -CH2OCH2-, -CH2OCH2CH2-, -CH2OCH2CH2CH2-, -CF2-, -CF2CF2-, -CF2CF2CF2-, -CH=CH-, -C ΓëíC-, -CH2CH=CH-, -CH2CH2CH=CH-, -CH=CHCH2-, -CH=CHCH2CH2-, -CH2C ΓëíC-, -CH=CH-CH=CH-, -CH=CH-CH=CH-CH=CH-, or -CH=CH-CH(CH3)-;
C and D, individually, are each hydrogen, C,_3 alkyl, trifluormethyl, or cyclpropyl: or C and D, together with the commonly bound carbon atom, is cyclopropyl;
E is hydrogen, methyl, methoxy, halogen, trifluoromethoxy or hydroxy, provided that when E is hydroxy, then either C or D is not hydrogen; and
R5 is hydrogen, methyl, ethyl, halogen, vinyl, phenyl, or halomethyl.
3. A conjugate of Claim 2 which is (5Z,7E)-(3S)-9,10-seco-cholesta- ,7,10(19)-triene-3-phosphocholine.
4. A conjugate of Claim 2 selected from the group consisting of: (5Z,7E)-(3S)-9,10-seco-5,7,10(19)-cholestatriene-25-ol-3-phosphocholine; (5Z,7E)-(lS,3R)-9, 10-seco-5,7, 10(19)-cholestatriene- l ,25-diol-3- phosphocholine;
(5Z,7E,22E)-(3S)-9,10-seco-5,7,10(19),22-ergostatetraen-3-phosphocholine;
(5Z,7E,22E,24S)-(lR,3S)-24-cyclopropyl-9,10-secochola-5,7,10(19),22- tetraene- 1 ,24-diol-3-phosphocholine;
(20R)-(4-ethyl-4-hydroxyhexyloxy)-(lS)-hydroxy-9, 10-secopregna- 5(Z),7(E), 10(19)-triene-(3R)-phosphocholine;
(20R)-(5-ethyl-5-hydroxyhepta-l,3-dienyl)-(lS)-hydroxy-9,10-secopregna- 5(Z),7(E), 10(19)-triene-(3R)-phosphocholine;
(5Z,7E)-(3S)-9, 10-secocholesta-5,7,10(19)-triene-3-phospho-(N-methyl)- ethanolamine; and
(5Z,7E)-(3S)-9, 10-secocholesta-5,7, 10(19)-triene-3-phospho-(N,N- dimethyl)-ethanolamine.
5. A conjugate according to any one of Claims 1 through 4 for use in the treatment of tumors, psoriasis, or inflammation in mammals.
6. A pharmaceutical composition comprising an anti-tumor, anti-psoriatic, or anti-inflammatory amount of a conjugate according to any one of Claims 1 through 4 in combination with a pharmaceutically-acceptable carrier.
7. Use of a conjugate according to any one of Claims 1 through 4 in the manufacture of a medicament for the treatment of tumors, psoriasis, or inflammation in mammals.
PCT/US1997/021931 1997-11-24 1997-11-24 Phosphoethanolamine conjugates of vitamin d compounds WO1999026953A1 (en)

Priority Applications (3)

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EP97948592A EP1034178A1 (en) 1997-11-24 1997-11-24 Phosphoethanolamine conjugates of vitamin d compounds
AU54631/98A AU5463198A (en) 1997-11-24 1997-11-24 Phosphoethanolamine conjugates of vitamin d compounds
PCT/US1997/021931 WO1999026953A1 (en) 1997-11-24 1997-11-24 Phosphoethanolamine conjugates of vitamin d compounds

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US5206229A (en) * 1988-04-21 1993-04-27 Leo Pharmaceutical Products Ltd Vitamin d analogues
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US5661138A (en) * 1996-10-03 1997-08-26 Clarion Pharmaceutical, Inc. (o-Acyl-p-N-acylamino-phenyl)-O-phosphoethanolamines
US5691328A (en) * 1996-02-02 1997-11-25 Clarion Pharmaceuticals Inc. Phosphoethanolamine conjugates of vitamin D compounds

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017177296A1 (en) * 2016-04-13 2017-10-19 Acolli S.A. Food supplement based on 2-aminoethyl dihydrogen phosphate and synthesis method

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