Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
  • A61K31/4025—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil not condensed and containing further heterocyclic rings, e.g. cromakalim
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
  • A61K31/35—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin having six-membered rings with one oxygen as the only ring hetero atom
  • A61K31/352—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin having six-membered rings with one oxygen as the only ring hetero atom condensed with carbocyclic rings, e.g. methantheline 
  • A61K31/353—3,4-Dihydrobenzopyrans, e.g. chroman, catechin

Definitions

• the present invention relates to the use of compounds of the general formula I for the treatment of patients suffering from gynaecological disorders, especially endometriosis, dysfunctional bleedings, endometrial cancer, polycystic ovarian syndrome and anovulatoric bleeding and prophylaxis hereof. Furthermore, this invention also relates to the use of compounds of the general formula I for the induction of endometrial thinning e.g. prior to surgery on the uterus. The present invention also embraces pharmaceutical compositions comprising these compounds and methods of using the compounds and their pharmaceutical compositions.
• a number of endocrine disorders in the breast and the reproductive organs in women is associated with an disturbed stimulation with oestrogen on the involved tissues.
• Endometriosis is a disorder characterised by an occurrence of endometrial tissue outside the uterine cavity. This tissue is sensitive to the cyclic estradiol stimulation which occurs during the normal menstrual cycle. The symptoms include dysmenorrhoea, dyspareunia, infertility, abdominal pains, obstipation and mechanical ileus.
• the current treatment of endometriosis is surgery or a medical suppression of ovarian function by continuous or cyclic treatment by a combination of oestrogen and gestagen or gestagen alone or a suppression with a synthetic gestagen- like derivative of testosterone. Surgery is expensive and only suitable when the endometriosis is localized. Oestrogen/gestagen in different combinations is associated with bleeding disorders whereas danazol treatment is expensive and associated with side-effects such as meno- pausal syndrome and virilization.
• One object of the present invention is to provide compounds which can effectively be used in the treatment or prophylaxis of endometriosis.
• Dysmenorrhoea in ovulatory cycles and dysfunctional uterine bleeding in anovulatory cycles are disorders which are characterised by transient disruptions of the synchronous hypothalamic-pituitary-ovarian patterns necessary for the regular ovulatory cycles.
• Dysfunctional uterine bleeding can also result from either a sudden withdrawal of oestrogen or as a breakthrough bleeding after prolonged oestrogen stimulation. In common the pathogenesis of these disorders therefore include abnormal endometrial oestrogen stimulation.
• the treatment of these disorders involves different regimens of oestrogen oral contraceptives which can be associated with other forms of bleeding disorders and menopausal-like syndrome.
• a further object of the present invention is to provide compounds which can effectively be used in the treatment or prophylaxis of dysfunctional bleedings.
• An object of the present invention is also to provide compounds which can effectively be used in the treatment or prophylaxis of anovulatoric bleeding.
• Surgical techniques such as endometrial ablation and resection are being increasingly used in women with dysfunctional uterine bleeding as an alternative to hysterectomy. This allows women to be treated as day patients, and reduces the convalescence period from six weeks to two- or three days.
• Dysfunctional uterine bleeding is estimated to affect 20% of women during their reproductive years. Prethinning of the endometrium creates optimal surgical conditions by reducing fluid absorption, a potentially serious condition in ablative surgery. For the time being only danazol, which is expensive and associated with side- effects such as menopausal symptoms and virilization has been licensed for this indication.
• Another object of the present invention is to provide compounds which can effectively be used for endometrial thinning e.g. prior to surgery on the uterus.
• Endometrial cancer is the most common gynaecologic malignancy in the United States, and its incidence is rising. Some patients are at high risk of developing endometrial carcinoma and include the obese, diabetic, hypertensive and infertile; those with failure of ovulation and dysfunctional bleeding; longstanding oestrogen users; and those with severe degree of endometrial hyperplasia. The common denominator for many of these risk factors is excess oestrogenic stimulation. Besides different possibilities for the treatment of the different underlying risk factors no treatment exists which can reduce development of carcinomas at the level of the endometrium.
• Another object of the present invention is to provide compounds which can effectively be used in the treatment or prophylaxis of endometrial cancer.
• Polycystic ovaries are characterised by multiple follicular cysts or cystic follicles with varying degree of luteinization of the theca interna and different degrees of oestrogen overproduction. This will result in con ⁇ stant and prolonged endometrial oestrogen stimulation which causes infertility and increases the risk of different bleeding disorders and the risk of developing endometrial carcinoma.
• the treatment of polycystic ovaries is in general directed by a desire for pregnancy by the patient, and therapy constitutes either surgery or medical induction of ovulation. If this proves unsuccessful the patient can be treated with oral oestrogen contraceptives which, however can lead to different bleeding disorders and after prolonged treatment increase the risk of developing endometrial carcinoma.
• Yet another object of the present invention is to provide compounds which can effectively be used in the treatment or prophylaxis of polycys- tic ovarian syndrome.
• Centchroman is a non-steroidal compound known to have antiestrogenic activity. It is in use in India as an oral contraceptive (see, for example, Salman et al., U.S. Patent Specification No. 4,447,622; Singh et al., Acta Endocrinal (Copenh) 126 (1992). 444 - 450: Grubb. Curr Qpin
• Centchro ⁇ man has also been investigated as an anti-cancer agent for treatment of advanced breast cancer (Misra et al., Int J Cancer 43 (1989), 781 - 783. Recently, centchroman as a racemate has been found potent as a cholesterol lowering pharmaceutical expressed by a significant decrease of the serum concentrations (S.D. Bain et al. r J Min Bon Res 9 (1994), S 394).
• the present invention is based in part on the discovery that a representa ⁇ tive 3,4-diarylchroman, centchroman (3,4-trans-2,2-dimethyl-3-phenyl-4- [p-(beta-pyrrolidinoethoxy)phenyl]-7-methoxychroman) is effective against endometriosis, dysfunctional bleeding, anovulatoric bleeding and polycystic ovarian syndrome, inter alia in rats.
• These animal models mimic the pre-menopausal condition and are generally recognized models of above mentioned indications.
• These data thus indicate that the 3,4- diar ⁇ lchromans are useful as therapeutic agents against endometriosis, dysfunctional bleeding, anovulatoric bleeding and polycystic ovarian syndrome in mammals, including primates such as humans.
• the present invention is furthermore based in part on the discovery that a representative 3,4-diarylchroman, centchroman (3,4-trans-2,2- dimethyl-3-phenyl-4-[p-(beta-pyrrolidinoethoxy)phenyl]-7-methoxychro- man) is effective against endometrial cancer, inter alia in rats.
• a representative 3,4-diarylchroman, centchroman (3,4-trans-2,2- dimethyl-3-phenyl-4-[p-(beta-pyrrolidinoethoxy)phenyl]-7-methoxychro- man) is effective against endometrial cancer, inter alia in rats.
• These animal models mimic the peri-menopausal condition and are generally recognized models of endometrial cancer.
• These data thus indicate that the 3,4-diarylchromans are useful as therapeutic agents against endometrial cancer in mammals, including primates such as humans.
• the present invention is based in part on the discovery that a representative 3,4-diarylchroman, centchroman is effective as an agent for thinning of the endometrium e.g. prior to surgery on the uterine tissues, inter alia in rats. These animal models mimic the pre-menopausal condition and are generally recognized models of endometrial hyperplasia. These data thus indicate that the 3,4-diarylchromans are useful as agents for the induction of thinning of the endometrium e.g. prior to surgery.
• R1 , R4 and R5 are individually hydrogen, halogen, trifluorome- thyl, lower alkyl, lower alkoxy or (tertiary amino)(lower alkoxy); and R2 and R3 are individually hydrogen or a lower alkyl.
• lower alkyl includes straight and branched chain alkyl radicals containing from 1 to 6 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, n-amyl, sec-amyl, n-hexyl, 2-ethylbutyl, 2,3-dimethylbutyl and the like.
• lower alkoxy includes straight and branched chain alkoxy radicals containing from 1 to 6 carbon atoms, such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, tert-butoxy, n-amyloxy, sec-amyloxy, n-hexyloxy, 2-ethylbutoxy, 2,3-dimethylbutoxy and the like.
• Hydrogen includes chloro, fluoro, bromo and iodo.
• the tertiary amino radical may be a dialkylamine such as a dimethyl, diethyl, dipropyl, dibutyl or a polymethyleneimine, e.g.
• Preferred compounds include those in which R1 is lower alkoxy; R2 and R3 are lower alkyl, especially methyl; R4 is hydrogen; and R5 is (tertiary amino)(lower alkoxy) of the polyme ⁇ thyleneimine type.
• R1 is in the 7-position and is lower alkoxy, particularly methoxy; each of R2 and R3 is methyl, R4 is hydrogen and R5 is in the 4-position and is a (tertiary aminoMlower alkoxy) radical such as pyrrolidinoethoxy.
• R1 is in the 7-position and is lower alkoxy, particularly methoxy
• each of R2 and R3 is methyl
• R4 is hydrogen
• R5 is in the 4-position and is a (tertiary aminoMlower alkoxy) radical such as pyrrolidinoethoxy.
• To be included by this invention are all pharmaceutically acceptable salts of the mentioned compounds of formula I.
• the compounds of formula I in the transconfigura- tion. These compounds may be used as racemic mixtures, or the isolated d- or I- enantiomers may be used. The trans-l-enantiomers are more preferred.
• centchroman having the formula IV as stated in claim 17.
• 3,4-diarylchromans are prepared according to known methods, such as those disclosed in U.S. Patent Specification No. 3,340,276 to Carney et al., U.S. Patent Specification No. 3,822,287 to Bolger, and Ray et al., Med Chem 19 (1976), 276 - 279, the contents of which are incorpo- rated herein by reference. Conversion of the cis isomer to the trans configuration by means of an organometallic base-catalyzed rearrange ⁇ ment is disclosed In U.S. Patent Specification No. 3,822,287.
• the optically active d- and l-enantiomers may be prepared as disclosed by Salman et al. in U.S. Patent Specification No. 4,447,622 (incorporated herein by reference) by forming an optically active acid salt which is subjected to alkaline hydrolysis to produce the desired enantiomer.
• 3,4-diarylchromans may be prepared in the form of pharmaceutically acceptable salts, especially acid-addition salts, including salts of organic acids and mineral acids.
• salts include salts of organic acids such as fumaric acid, formic acid, acetic acid, propionic acid, glycolic acid, lactic acid, pyruvic acid, oxalic acid, succinic acid, malic acid, tartaric acid, citric acid, benzoic acid, salicylic acid and the like.
• Suitable inorganic acid-addition salts include salts of hydrochloric, hydrobromic, sulphuric and phosphoric acids and the like.
• the acid addition salts may be obtained as the direct products of com- pound synthesis.
• the free base may be dissolved in a suitable solvent containing the appropriate acid, and the salt isolated by evaporating the solvent or otherwise separating the salt and solvent.
• 3,4-diarylchromans and their salts are useful within human and veteri- nary medicine, for example, in the treatment of patients suffering from gynaecological disorders especially endometriosis, dysfunctional bleed ⁇ ings, endometrial cancer, polycystic ovarian syndrome and anovolatoric bleeding and furthermore for the induction of endometrial thinning.
• 3,4-diarylchromans and their pharma- ceutically acceptable salts are formulated with a pharmaceutically acceptable carrier to provide a medicament for parenteral, oral, nasal, rectal, subdermal or intradermal or transdermal administration according to conventional methods.
• Formulations may further include one or more diluents, fillers, emulsifiers, preservatives, buffers, excipients, etc. and may be provided in such forms as liquids, powders, emulsions, supposi ⁇ tories, liposomes, transdermal patches, controlled release, dermal implants, tablets, etc.
• diluents such as those disclosed in Remington's Pharmaceutical Sciences. Gennaro, ed., Mack Publishing Co., Easton, PA, 1990.
• the active compound is prepared in a form suitable for oral administration, such as a tablet or capsule.
• a pharmaceutically acceptable salt of the compound is com- bined with a carrier and moulded into a tablet.
• Suitable carriers include starch, sugars, dicalcium phosphate, calcium stearate, magnesium stearate and the like.
• Such compositions may further include one or more auxiliary substances, such as wetting agents, emulsifiers, preservatives, stabilizers, colouring additives, etc.
• compositions are administered one or more times per day or week.
• An effective amount of such a pharmaceutical composition is the amount that provides a clinically significant effect against gynaecolo ⁇ gical disorders especially endometriosis, dysfunctional bleedings, endo ⁇ metrial cancer, polycystic ovarian syndrome and anovolatoric bleeding or for induction of endometrial thinning.
• Such amounts will depend, in part, on the particular condition to be treated, age, weight, and general health of the patient, and other factors evident to those skilled in the art.
• compositions may be administered in unit dosage form one or more times per day or week.
• they may be provided as controlled release formulations suitable for dermal implanta ⁇ tion.
• Implants are formulated to provide release of active compound over the desired period of time, which can be up to several years. Controlled- release formulations are disclosed by, for example, Sanders et al., J Pharm Sci 73 (1964), 1294 - 1297, 1984; U.S. Patent Specification No. 4,489,056; and U.S. Patent Specification No. 4,210,644, which are incorporated herein by reference.
• centchroman as a racemic mixture and as l-centchroman and d-centchroman.
• 3,4-trans-2,2- dimethyl-3-phenyl-4-[4-(2-(pyrrolidin-1 -yl)ethoxy)phenyl]-7-hydroxychro- man is a preferred compound.
• the more preferred compound is isolated l-centchroman (l-3,4-trans-2,2-dimethyl-3-phenyl-4-[p-(beta-pyrrolidino- ethoxy)phenyl]-7-methoxychroman).
• Examples of pharmaceutically acceptable acid addition salts are salts with non-toxic acids, either inorganic acids such as hydrochloric acid, sulphuric acid and phosphoric acid, or organic acids such as fumaric acid, formic acid, acetic acid, propionic acid, succinic acid, gluconic acid, lactic acid, citric acid, ascorbic acid, benzoic acid, embonic acid, metha- nesulphonic acid and malonic acid.
• inorganic acids such as hydrochloric acid, sulphuric acid and phosphoric acid
• organic acids such as fumaric acid, formic acid, acetic acid, propionic acid, succinic acid, gluconic acid, lactic acid, citric acid, ascorbic acid, benzoic acid, embonic acid, metha- nesulphonic acid and malonic acid.
• Sprague-Dawley sexually mature female rats (200-225 g) were obtained from Mollegaards breeding center, LI Skensved, Denmark. The rats were housed in metal hanging cages in groups of two and had ad libitum access to food and water for one week. Room temperature was maintained at 20° ⁇ 1.5 ° with a minimum relative humidity of 40%. The photoperiod in the room was 12 hours light and 12 hours dark.
• the rats were at random divided into five treatment groups of each 4 rats and daily oral treatment with the test compound was initiated.
• the test compound was given in five doses (0 mg/kg/day, 5 mg/kg/day, 10 mg/kg/day, 25 mg/kg/day or 75 mg/kg /day) for fourteen days.
• the animals were weighed and sacrificed by asphyxiation with CO 2 , the uterus was removed through a midline incision, and a wet uterine weight was determined after gently blotting on a towel.
• centchroman acts as an antagonist to the normal stimulating effect of oestrogen on the uterus. This was supported by the subsequent microscopy, which revealed an atrophic endometrium in these rats.

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• Pharmacology & Pharmacy (AREA)
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• Life Sciences & Earth Sciences (AREA)
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• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

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Citations (1)

• 1995
  • 1995-01-10 HU HU9702244A patent/HUP9702244A3/hu unknown
• 1996
  • 1996-01-10 AU AU43293/96A patent/AU693628B2/en not_active Ceased
  • 1996-01-10 JP JP8521378A patent/JPH10511962A/ja active Pending
  • 1996-01-10 WO PCT/DK1996/000015 patent/WO1996021444A1/en not_active Application Discontinuation
  • 1996-01-10 CA CA002208861A patent/CA2208861A1/en not_active Abandoned
  • 1996-01-10 CZ CZ972122A patent/CZ212297A3/cs unknown
  • 1996-01-10 MX MX9705219A patent/MX9705219A/es unknown
  • 1996-01-10 EP EP96900096A patent/EP0804190A1/en not_active Withdrawn
  • 1996-01-10 CN CN96191414A patent/CN1168096A/zh active Pending
  • 1996-01-12 IL IL11674696A patent/IL116746A0/xx unknown
• 1997
  • 1997-07-11 NO NO973243A patent/NO973243L/no unknown

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