C13-substituted estra-1,3,5,(10)-trien-3-yl sulfamates, methods of preparing same, and pharmaceutical compositions containing these compounds

Abstract

The invention relates to new C13-substituted estra-1,3,5(10)-trien-3-yl sulfamates of general formula I, wherein R1 represents an acyl residue, oxycarbonyl residue, aminocarbonyl residue, sulfonyl residue, or aminosulfonyl residue, and R15 represents ethyl, methods of preparing same, and pharmaceutical compositions containing these compounds.The compounds of the invention of general formula I inhibit the activity of steroid sulfatase (EC 3.1.6.2) and do not exhibit any estrogenic effect.

Description

BACKGROUND OF THE INVENTION

The invention relates to new estra-1,3,5(10)-trien-3-yl sulfamates having a C 2 -C 5 alkyl, alkenyl or alkynyl residue in C 13 position and an acyl, oxycarbonyl, aminocarbonyl, sulfonyl, or aminosulfonyl residue on the nitrogen atom of the sulfamate group. The invention is also directed to methods of producing the compounds according to the invention, and to pharmaceutical compositions containing these compounds. The compounds of the invention were found to be steroid sulfatase inhibitors, which exhibit no estrogenic effect.

In the human organism, estrogens are predominantly synthesized and secreted by the ovaries. Accordingly, the estradiol, estrone and estrone sulfate blood levels are subject to fluctuations in sexually mature women during the cycle. During human pregnancy, substantially higher amounts of estrogen are secreted by the placenta compared to the ovary. In addition to these estrogen sources, peripheral estrogen sources play a role in the human organism which, above all, gain importance in those cases where ovarian estrogen secretion has ceased or has not been established yet. As has been demonstrated, these estrogen sources are of major physiological importance in males as well.

Various tissues possess an enzymatic equipment (Purohit A. et al., Regulation of aromatase and sulphatase in breast tumor cells, 150 (1996), p. 65) that causes conversion of adrenal steroids to estrone and estradiol in tissue. Their effect proceeds in an autocrine or paracrine fashion at the site of biosynthesis, and significant estrogen levels do not necessarily have to appear in the blood. Another mechanism by which biologically relevant amounts of estrogen are formed in the tissue is hydrolytic cleavage of estrogen conjugates, particularly estrone sulfate. In this context, the production of estrone in the endometrium and in breast tissue and the tumors proceeding from such tissue is of special pathological importance, because tumor growth can be stimulated in this way. In breast carcinoma, it has been found that the amount of estrogen generated by sulfatase activity (cleavage of estrone sulfate) exceeds that via aromatase by a factor of 50-300 fold (Pasqualini J. R. et al., Estrone sulfatase versus estrone sulfotransferase in human breast cancer: potential clinical applications. J. Steroid Biochem. and Mol. Biol. 69 (1999) 287-292). Similar findings have been gathered by other groups as well. In breast tissue, 10 times more estrone is produced from androstenedione via sulfatase than via aromatase.

Accordingly, the fact can be regarded as proven that sulfatase inhibitors are capable of inhibiting the growth of estrogen-dependent tumors with high efficiency, because they massively reduce the estrogen concentration in the tumor tissue itself.

Under therapeutic aspects, sulfatase inhibitors are therefore the subject of intensified search, which themselves are non-estrogenic and do not yield estrogenic products as a result of hydrolysis. Thus, for example, Purohit A. et al., J. Steroid Biochem. Molec. Biol., Vol. 64, No. 5-6, pp. 269-275 (1998), describe 2-methoxyestrone 3-O-sulfamate to be a potent sulfatase inhibitor that does not exhibit any estrogenic effect on the uterine growth in ovariectomized rats. Estrone 3-O-sulfamates as sulfatase inhibitors have also been described in WO 93/05064. The estrone 3-O-sulfamate with an unsubstituted nitrogen is a strong sulfatase inhibitor (cf., Horwarth et al. in J. Med. Chem. 1994, 37, pp. 219-221, particularly FIG. 3 on page 220). However, this substance also exhibits a strong estrogenic effect, as described by Elger W. et al. in J. Steroid Biochem. Mol. Biol. 55 (1995), pp. 395-403. Other estrone 3-O-sulfamates as sulfatase inhibitors have been disclosed in WO 99/33858. These compounds have no essential estrogenic activity.

Bioorg. & Med. Chem. Lett. 7, 24, 3075-3080 (1997), describes N-acetylestrone 3-O-sulfamate as sulfatase inhibitor. However, this compound has a strong estrogenic effect, exceeding ethynylestradiol with respect to its systemic oral efficacy (cf., WO 97/14712).

Likewise, the DE 197 12 488 A1 describes steroid sulfamates which inhibit steroid sulfatase. The estrogenic effect of these compounds is low or absent. Certain steroid sulfamoyloxy compounds having more than one sulfamate group in their molecules, particularly those which are sulfamoylated in positions characteristic for an estrogenic effect, including substituents or side chains (e.g., in 7 and/or 11 position) which may be located at the periphery of the steroid skeleton, have been described to exhibit a significant increase in sulfatase activity with reduced estrogenic effect. Thus, 3,17-disulfamoyloxy derivatives in particular show good sulfatase activity. According to DE 197 12 488 A1, monosulfamates likewise have good sulfatase inhibition with low estrogenicity, with the exception of A ring sulfamates. As mentioned above, A ring sulfamates are known from WO 97/14712 to be compounds having a distinctly strong estrogenic effect.

SUMMARY OF THE INVENTION

It was the object of the present invention to provide additional steroid sulfatase inhibitors which themselves do not exhibit any estrogenic effect and will not yield any estrogenic products as a result of hydrolysis

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Surprisingly, it was found that new C 13 -substituted estra-1,3,5(10)-trien-3-yl sulfamates of general formula I, their physiologically tolerable salts or eaters,

wherein

R 1 represents COR 3 , COOR 4 , CONR 5 R 6 , SO 2 R 4 , SO 2 NR 5 R 6 ,

R 2 represents hydrogen, C 1 -C 10 alkyl, C 1 -C 10 alkoxyalkyl, C 3 -C 10 cycloalkyl, C 2 -C 10 alkenyl, C 2 -C 10 alkynyl, aryl, aryl (C 1 -C 3 )alkyl, or C 1 -C 3 alkylaryl, COR 3 ; COOR 4 ; CONR 5 R 6 ; SO 2 R 4 ; SO 2 NR 5 R 6 ,

R 3 represents H or R 4 ,

R 4 represents C 1 -C 17 alkyl, C 1 -C 17 haloalkyl, C 2 -C 17 alkenyl, C 2 -C 17 alkynyl, C 3 -C 10 cycloalkyl, aryl, aryl(C 1 -C 3 )alkyl, C 1 -C 3 alkylaryl,

R 5 , R 6 independently represent hydrogen, C 1 -C 5 alkyl, C 1 -C 5 haloalkyl, aryl, aryl(C 1 -C 3 )alkyl, C 1 -C 3 alkylaryl, or, together with the nitrogen atom to which they are bound, form a polymethyleneimino residue having 2-6 C atoms or a morpholino residue,

R 7 , R 9 independently represent H, OH, halogen, C 1 -C 5 alkoxy or C 1 -C 5 haloalkoxy,

R 8 represents H, OH, C 1 -C 5 alkyl, C 1 -C 5 haloalkyl, C 2 -C 5 alkenyl, C 2 -C 5 alkynyl, or halogen,

R 10 , R 11 represent hydrogen, or R 10 and R 11 together represent a CH 2 group,

R 12 , R 13 , R 14 independently represent H, OH, C 1 -C 5 alkoxy, or C 1 -C 5 haloalkoxy, or

R 12 represents halogen, or

R 13 and R 14 together represent oxygen, or together represent a ═CXY group wherein X and Y independently represent hydrogen, halogen or a C 1 -C 5 alkyl group, or

R 13 , R 14 independently represent C 1 -C 5 alkyl, C 2 -C 5 alkenyl, or C 2 -C 5 alkynyl,

R 15 represents C 2 -C 5 alkyl, C 2 -C 5 alkenyl or C 2 -C 5 alkynyl,

R 8 , R 9 , R 10 , R 12 , R 13 , R 15 independently are in α or β position, and

up to 2 additional double bonds may be present in rings B and C, inhibit the activity of steroid sulfatase (EC 3.1.6.2) with extreme efficiency and do not exhibit any estrogenic effect.

In the meaning of the invention, physiologically tolerable salts are alkali or alkaline earth salts, particularly sodium, potassium or ammonium salts.

Conventional, physiologically tolerable inorganic or organic acids which may be esterified with the free hydroxy groups of the compounds of general formula I are e.g. phosphoric acid, sulfuric acid, oxalic acid, maleic acid, fumaric acid, lactic acid, tartaric acid, malic acid, citric acid, salicylic acid, adipic acid, and benzoic acid.

In the meaning of the invention, alkyl represents a branched or unbranched hydrocarbon chain. Accordingly, halozalkyl represents a mono- or polyhalogen-substituted, branched or unbranched hydrocarbon chain. Alkenyl represents a branched or unbranched hydrocarbon chain having at least one double bond. Alkynyl represents a branched or unbranched hydrocarbon chain having at least one triple bond.

Alkoxy represents a branched or unbranched hydrocarbon chain with one or more intervening oxygen atoms. In case of haloalkoxy, the alkoxy residue may be mono- or polysubstituted with halogen.

In the meaning of the invention, aryl represents a phenyl residue which may optionally be substituted, or a heteroaryl residue, e.g. pyridine, picoline, lutidine. collidine, quinoline, acridine, pyridazine, pyrimidine, pyrazine, triazine, pterine, pyrrole, indole, pyrazole, imidazole, 1,2,3-triazole, 1,2,4-triazole, tetrazole, oxazole, thiazole, thiodiazole.

In a particularly preferred embodiment of the invention, R 2 represents hydrogen. More preferably, R 1 represents an acyl residue, —COR 3 . In a preferred embodiment, R 15 represents ethyl or propyl.

Especially preferred compounds of the invention are the following:

1) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-formyl)-sulfamate

2) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)-sulfamate

3) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

4) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-propionyl)sulfamate

5) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-propionyl)sulfamate

6) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-butyryl)-sulfamate

7) 17α-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-butyryl)sulfamate

8) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-valeryl)-sulfamate

9) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-valeryl)sulfamate

10) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl-(N-hexanoyl)-sulfamate

11) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-hexanoyl)sulfamate

12) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-decanoyl)-sulfamate

13) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-stearoyl)-sulfamate

14) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-cyclopentanecarbonyl)sulfamate

15) 17-Oxo-14α,15α-methylene-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

16) 17β-Hydroxy-2-methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl [N-(2,2-dimethyl)propionyl]sulfamate

17) 16α-Fluoro-17β-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

18) 17β-Hydroxy-7α-methyl-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

19) 13-Ethyl-17-hydroxy-18,19-dinor-17α-pregna-1,3,5(10)-trien-20-yn-3-yl (N-acetyl)sulfamate

20) 17β-Methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-formyl)sulfamate

21) 17-Oxo-18a-homo-estra-1,3,5(10),8-tetraen-3-yl (N-acetyl)sulfamate

22) 17β-Hydroxy-13-propyl-gona-1,3,5(10)-trien-3-yl (N-acetyl)-sulfamate

23) 17-Oxo-13-propyl-gona-1,3,5(10)-trien-3-yl (N-acetyl)-sulfamate

24) 16α-Fluoro-17-oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

25) 16β-Fluoro-17-oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

26) 16α-Fluoro-17β-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

27) 16α-Fluoro-17α-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

28) 16β-Fluoro-17β-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

29) 16β-Fluoro-17α-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

30) 2-Methoxy-17-oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

31) 17β-Hydroxy-2-methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

32) 2,17β-Dimethoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

33) 17β-tert-Butoxy-2-methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

34) 16α-Fluoro-2-methoxy-17-oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

35) 16α-Fluoro-17β-hydroxy-2-methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

36) 2-Ethoxy-17-oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

37) 2-Ethoxy-17β-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

38) 18a-Homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

39) 17-Methylene-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

40) 17-Difluoromethylene-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

41) 17-Ethylidene-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

42) 17-Oxo-18a-homo-13α-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

43) 17β-Hydroxy-18a-homo-13α-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

44) 17-Oxo-18a-homo-13α-estra-1,3,5(10),8-tetraen-3-yl (N-acetyl)sulfamate

45) 17-Oxo-18a-homo-estra-1,3,5(10),6,8-pentaen-3-yl (N-acetyl)sulfamate

46) 17-Oxo-18a-homo-estra-1,3,5(10),7-tetraen-3-yl (N-acetyl)sulfamate

47) 17-Oxo-18a-homo-estra-1,3,5(10),8(14)-tetraen-3-yl (N-acetyl)sulfamate

48) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-trifluoroacetyl)sulfamate

49) 17-Oxo-18a-homo-1,3,5(10)-trien-3-yl (N-nonafluorovaleroyl)sulfamate

50) 17-Oxo-2-trifluoromethoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate

Surprisingly, replacement of the C 13 methyl group which is characteristic for estra-1,3,5(10)-triene derivatives by a C 2 -C 5 alkyl group in 13 position, which optionally may include double or triple bonds, results in complete disappearance of the estrogenic effect without impairing the sulfatase-inhibiting activity of the compounds.

The strong sulfatase-inhibiting activity of the compounds according to the invention becomes manifest in a reduced cleavage of estrone sulfate in organs and tissues of ovariectomized rats. Another characteristic is that the ratio of toluene-extractable metabolites of estrone sulfate in the blood is massively reduced. Therefore, the action pattern of the compounds according to the invention allows their use in the production of drugs for the treatment of estrogen-dependent diseases, namely, for all those therapies where the sulfatase activity is to be inhibited and an estrogenic side effect is undesirable. The treatment of estrogen-dependent tumor diseases may be mentioned as an example.

Therefore, the present invention is also directed to pharmaceutical compositions containing at least one compound of general formula I, optionally together with pharmaceutically tolerable adjuvants and/or vehicles.

Such pharmaceutical compositions and drugs can be used in oral, rectal, vaginal, subcutaneous, percutaneous, intravenous, or intramuscular applications. In addition to conventional vehicles and/or diluents, they contain at least one compound of general formula I.

The drugs of the invention are produced in a well-known fashion using conventional solid or liquid vehicles or diluents and conventionally employed pharmaceutic-technical adjuvants, with a suitable dosage as appropriate for the desired type of application. Preferred formulations consist of an administration form which is suitable for oral application. For example, such administration forms are tablets, film tablets, coated tablets, capsules, pills, powders, solutions or suspensions, or depot forms as well.

Obviously, parenteral formulations such as injection solutions are also possible. Furthermore, suppositories and agents for vaginal application may also be mentioned, for example.

For example, appropriate tablets can be obtained by mixing the active substance with well-known adjuvants, e.g. inert diluents such as dextrose, sugar, sorbitol, mannitol, polyvinylpyrrolidone, disintegrants such as corn starch or alginic acid, binders such as starch or gelatin, lubricants such as magnesium stearate or talc, and/or agents to achieve a depot effect, such as carboxypolymethylene, carboxymethylcellulose, cellulose acetate phthalate, or polyvinyl acetate. The tablets may also be made up of several layers.

Similarly, coated tablets can be produced by coating cores prepared in an analogous fashion as tablets, using agents conventionally employed in tablet coatings, e.g. polyvinylpyrrolidone or shellac, gum arabic, talc, titanium oxide, or sugar. The coating may also consist of multiple layers, where the adjuvants mentioned above in context with the tablets can be used.

Solutions or suspensions including the compounds of the invention of general formula I may additionally contain taste-improving agents such as saccharine, cyclamate or sugars, as well as e.g. flavors, such as vanillin or orange extract. In addition, they may contain suspending aids such as sodium carboxymethylcellulose, or preservatives such as p-hydroxybenzoates.

For example, capsules containing the compounds of general formula I can be produced by mixing the compound(s) of general formula I with an inert vehicle such as lactose or sorbitol and encapsulating in gelatin capsules.

For example, suitable suppositories can be produced by admixing vehicles intended for such purpose, such as neutral fats or polyethyleneglycol or derivatives thereof.

Suitable dosages of the compounds according to the invention are from 0.001 to 10 mg per day, depending on body weight, age and constitution of the patient, and the required daily dose may be applied via single or multiple administrations.

The invention is also directed to a method of producing the compounds of the invention of general formula I

wherein the residues R 1 through R 15 have the above-specified meanings,

in which method

a) suitable estra-1,3,5(10)-trien-3-yl sulfamate derivatives having residues R 2 and R 7 through R 15 as indicated above, which have at least one hydrogen atom on the nitrogen atom of the sulfamate residue, are reacted with a suitable activated carboxylic acid, sulfonic acid or amidosulfonic acid, or a suitable activated carbonic acid monoester or carbonic acid monoamide or

b) suitable 3-hydroxy-estra-1,3,5 (10)-triene derivatives having residues R 7 through R 15 as indicated above are reacted with an activated (N—COR 3 )amidosulfonic acid, (N—COOR 4 )amidosulfonic acid, (N—CONR 5 R 6 )amidosulfonic acid, (N—SO 2 R 4 )amidosulfonic acid, or (N—SO 2 NR 5 R 6 )amidosulfonic acid,

in a per se known fashion, optionally in the presence of a base each time, the products thus obtained are optionally reacted further in a suitable manner, and the products thus obtained are optionally converted to physiologically tolerable metal salts or esters.

The 3-hydroxy-estra-1,3,5(10)-triene derivatives having residues R 7 through R 15 are prepared according to methods common in steroid chemistry, such as exemplified in Liebigs Ann. Chem. 702 (1967), 141-148. Estra-1,3,5(10)-trien-3-yl sulfamate derivatives having residues R 2 and R 7 through R 15 can be provided in analogy to methods exemplified in Steroids 61 (1996), 710-717.

Without in tending to be limiting, the following examples are to illustrate the invention in more detail.

EXAMPLE 1

17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-Acetyl)sulfamate

a) 6.0 g (0.021 mol) of 18a-methylestrone and 13.7 ml (0.123 mol) of 2,4,6-collidine were dissolved in 1.45 l of dichloromethane, 18.4 g (0.159 mol) of amidosulfonic acid chloride was added in portions at room temperature, and this was maintained at reflux for 4 hours. The cooled reaction mixture then was washed to neutrality, initially using 3×300 ml of water, then 2×200 ml of saturated sodium hydrogen carbonate solution, and finally water. The organic phase was dried with sodium sulfate, the solvent was distilled off, and the residue was recrystallized from ethyl acetate, thus obtaining 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl sulfamate; m.p.: 180-182° C. (ethyl acetate).

b) 5.5 g of the obtained sulfamate was dissolved in 55.2 ml of pyridine and added with 55.2 ml (0.500 mol) of acetic anhydride at room temperature. The reaction mixture was stirred at room temperature for 15 hours and then poured on crushed ice. The precipitate was filtrated off, washed to neutrality with water, and dried. Recrystallization from acetone/n-hexane afforded the title compound; m.p.: 204-206° C. (acetone/n-hexane).

EXAMPLE 2

17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-Propionyl)sulfamate

500 mg of the sulfamate obtained in Example 1a was dissolved in a mixture of 17 ml of dichloromethane and 0.2 ml of triethylamine. 175 mg of 4-dimethylaminopyridine and 3.7 ml of propionic anhydride were successively added, and the reaction mixture was stirred for 20 hours at room temperature. Thereafter, decomposition was effected using dilute aqueous hydrochloric acid. Following removal of the organic phase, the latter was washed with saturated aqueous sodium hydrogen carbonate solution and water, dried over anhydrous sodium sulfate, and concentrated in a vacuum rotatory evaporator. The residue was recrystallized from acetone, thus obtaining the title compound; m.p:. 187-188° C. (acetone; decomposition).

EXAMPLE 3

17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-Stearoyl)sulfamate

363 mg of the sulfamate obtained in Example 1a was dissolved in a mixture of 5 ml of pyridine and 5 ml of dichloromethane. This solution was added with 3.63 g of stearic acid chloride with stirring. Stirring was allowed to continue for 22 hours at room temperature, followed by addition of 10 ml of water with ice cooling and stirring for another 24 hours at room temperature. Subsequently, the organic phase was separated and washed successively with 2N aqueous hydrochloric acid, water, 2N aqueous potassium hydroxide solution, and water. Following drying over anhydrous sodium sulfate, the extract was concentrated in a vacuum rotatory evaporator, thereby obtaining the title compound as a light-yellow foam.

EXAMPLE 4

17-Oxo-19a-homo-estra-1,3,5(10)-trien-3-yl (N-Benzoyl)sulfamate

360 mg of the sulfamate obtained in Example 1a was dissolved in a mixture of 5 ml of dichloromethane and 5 ml of benzoyl chloride. Following addition of 1.2 ml of benzoyl chloride with stirring, the mixture was allowed to stand for 70 hours at room temperature. Thereafter, work-up was effected in accordance with Example 3. The crude product obtained was subjected to chromatography on silica gel (eluent: cyclohexane/ethyl acetate=1:2 v/v) . In this way, the title compound was obtained as an amorphous solid.

MS (electron impact ionization): 466.4 (M−H) + ; 468.3 (M+H) + ; 490.6 (M+Na) + .

EXAMPLE 5

Ovariectomized adult rats were treated with dosages of the compounds of the invention between 1 and 300 μg orally. 24 hours after the application, leukocyte and organ homogenates of these animals were examined for their capability of cleaving estrone sulfate. The substances according to the invention inhibited hydrolysis of estrone sulfate in the specified dose range between 50-90%. When treating animals with estrone sulfate 24 hours after the treatment with a substance according to the invention, the products of hydrolysis of the former can be extracted from the plasma after one hour. The substances according to the invention reduce the extractable ratio by about 75%.

EXAMPLE 6

17-Oxo-13a-homo-estra-1,3,5(10)-trien-3-yl (N-Trifluoro-acetyl)sulfamate

363 mg of the sulfamate obtained in Example 1a was dissolved in 4 ml of pyridine. The solution, cooled to −10° C., was added dropwise with 2 ml of trifluoroacetic anhydride with vigorous stirring, whereas the mixture was allowed to heat up to room temperature during addition. Following another 2 hours of stirring, the batch was poured on ice, and the reaction product was taken up in dichloromethane. The extract was washed with dilute hydrochloric acid and several times with water until neutrality, dried over anhydrous sodium sulfate and concentrated to dryness under vacuum. The product obtained was purified by means of flash chromatography on 32 g of silica gel 60 (0.040-0.063 mm) using toluene/chloroform/methanol 40:40:10 as eluent. The title compound could be precipitated in an amorphous form at −10° C. from an acetone solution using n-hexane.

MS (ESI): 458.3 (M−H) + ; 939.1 [2(M−H)+Na] + .

19 F-NMR (CF 3 COOH/DMSO) : 59.502 ppm.

EXAMPLE 7

17-Oxo-13a-homo-estra-1,3,5(10)-trien-3-yl (N-Cyclopentane-carbonyl)sulfamate

363 mg of the sulfamate obtained in Example 1a was stirred up in 3.5 ml of dichloromethane. This mixture was added with 256 mg of powdered potassium hydroxide, and the steroid underwent dissolution during addition. Subsequently, 0.18 ml of cyclopentanecarboxylic acid chloride was added dropwise within 10 minutes. Stirring was allowed to continue for 2 hours at room temperature, 3 ml of water was added, and this was added with dilute hydrochloric acid to pH make 1. The organic phase was removed, washed with water until neutrality, dried over anhydrous sodium sulfate, and concentrated under vacuum. The residue was purified by means of flash chromatography on silica gel 60 (0.040-0.063 mm) using chloroform/toluene/methanol 25:25:10 as eluent, and the title compound was obtained as a solid resin.

MS (EI) m/z 459.2077 (M + ).

Claims

1. A C13-substituted estra-1,3,5(10)-trien-3-yl sulfamate of general formula I, whereinR1 represents COR3, COOR4, CONR5R6, SO2R4, SO2NR5R6, R2 represents hydrogen, C1-C10 alkyl, C1-C10 alkoxyalkyl, C3-C10 cycloalkyl, C2-C10 alkenyl, C2-C10 alkynyl, aryl, aryl(C1-C3)alkyl, or C1-C3 alkylaryl, COR3; COOR4; CONR5R6; SO2R4; SO2NR5R6, R3 represents H or R4, R4 represents C1-C17 alkyl, C1-C17 haloalkyl, C2-C17 alkenyl, C2-C17 alkynyl, C3-C10 cycloalkyl, aryl, aryl(C1-C3)alkyl, C1-C3 alkylaryl, R5, R6 independently represent hydrogen, C1-C5 alkyl, C1-C5 haloalkyl, aryl, aryl(C1-C3)alkyl, C1-C3 alkylaryl, or, together with the nitrogen atom to which they are bound, form a polymethyleneimino residue having 2-6 C atoms or a morpholino residue, R7, R9 independently represent H, OH, halogen, C1-C5 alkoxy or C1-C5 haloalkoxy, R8 represents H, OH, C1-C5 alkyl, C1-C5 haloalkyl, C2-C5 alkenyl, C2-C5 alkynyl, or halogen, R10, R11 represent hydrogen, or R10 and R11 together represent a CH2 group, R12, R13, R14 independently represent H, OH, C1-C5 alkoxy, or C1-C5 haloalkoxy, or R12 represents halogen, or R13 and R14 together represent oxygen, or together represent a ═CXY group wherein X and Y independently represent hydrogen, halogen or a C1-C5 alkyl group, or R13, R14 independently represent C1-C5 alkyl, C2-C5 alkenyl, or C2-C5 alkynyl, R15 represents ethyl, R8, R9, R10, R12, R13, R15 independently are in α or β position, and up to 2 additional double bonds may be present in rings B and C, their physiologically tolerable salts or esters.

2. The compound according to claim 1, wherein R1 represents COR3.

3. The compound according to claim 1, wherein the R2 substituent represents hydrogen.

4. The compound according to claim 1, wherein the R15 substituent represents ethyl.

5. The compound according to claim 1, wherein said compounds are selected from the group consisting of:1) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-formyl)-sulfamate 2) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)-sulfamate 3) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 4) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-proprionyl)-sulfamate 5) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-propionyl)sulfamate 6) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-butyryl)-sulfamate 7) 17α-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-butyryl)-sulfamate 8) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-valeryl)-sulfamate 9) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-valeryl)sulfamate 10) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl- (N-hexanoyl)-sulfamate 11) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-hexanoyl)-sulfamate 12) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-decanoyl)-sulfamate 13) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-stearoyl)-sulfamate 14) 17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-cyclopentanecarbonyl)sulfamate 15) 17-Oxo-14α,15α-methylene-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 16) 17β-Hydroxy-2-methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl [N-(2,2-dimethyl)propionyl]sulfamate 17) 16α-Fluoro-17β-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 18) 17β-Hydroxy-7α-methyl-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 19) 13-Ethyl-17-hydroxy-18,19-dinor-17α-pregna-1,3,5(10)-trien-20-yn-3-yl (N-acetyl)sulfamate 20) 17β-Methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-formyl)sulfamate 21) 17-Oxo-18a-homo-estra-1,3,5(10)-tetraen-3-yl (N-acetyl)sulfamate 22) 16β-Fluoro-17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 23) 16α-Fluoro-17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 24) 16α-Fluoro-17β-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 25) 16α-Fluoro-17α-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 26) 16β-Fluoro-17β-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 27) 16β-Fluoro-17α-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 28) 2-Methoxy-17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 29) 17β-hydroxy-2-methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 30) 2,17β-Dimethoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 31) 17β-tert-Butoxy-2-methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 32) 16α-Fluoro-2-methoxy-17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 33) 16α-Fluoro-17β-hydroxy-2-methoxy-18a-homo-estra-1,3,5(10)-trien-3-yl(N-acetyl)sulfamate 34) 2-Ethoxy-17-Oxo-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 35) 2-Ethoxy-17β-hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 36) 8a-Homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 37) 17-Methylene-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 38) 17-Difluoromethylene-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 39) 17-Ethylidene-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 40) 17-Oxo-18a-homo-13α-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 41) 17β-Hydroxy-18a-homo-13α-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate 42) 17-Oxo-18a-homo-13α-estra-1,3,5(10)-tetraen-3-yl (N-acetyl)sulfamate 43) 17-Oxo-18a-homo-estra-1,3,5(10),6,8-pentaen-3-yl (N-acetyl)sulfamate 44) 17-Oxo-18a-homo-estra-1,3,5(10)-7-tetraen-3-yl (N-acetyl)sulfamate 45) 17-Oxo-18a-homo-estra-1,3,5(10),8(14)-tetraen-3-yl (N-acetyl)sulfamate 46) 17β-Hydroxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-trifluoroacetyl)sulfamate 47) 17-Oxo-18a-homo-1,3,5(10)-trien-3-yl (N-nonafluorovaleroyl)sulfamate; and 48) 17-Oxo-2-trifluoromethoxy-18a-homo-estra-1,3,5(10)-trien-3-yl (N-acetyl)sulfamate.

6. A method of preparing a compound of general formula I, wherein the residues R1 through R15 have the meanings specified in claim 1,in which methoda) suitable estra-1,3,5(10)-trien-3-yl sulfamate derivatives having residues R2 and R7 through R15 as indicated above, which have at least one hydrogen atom on the nitrogen atom of the sulfamate residue, are reacted with a suitable activated carboxylic acid, sulfonic acid or amidosulfonic acid, or a suitable activated carbonic acid monoester or carbonic acid monoamide or b) suitable 3-hydroxy-estra-1,3,5(10)-triene derivatives having residues R7 through R15 as indicated above are reacted with an activated (N—COR3)amidosulfonic acid, (N—COOR4)amidosulfonic acid, (N—CONR5R6)amidosulfonic acid, (N—SO2R4)amidosulfonic acid, or (N—SO2NR5R6)amidosulfonic acid.

7. A pharmaceutical composition, comprising at least one compound according to claim 1, in a pharmaceutically acceptable carrier.

8. A pharmaceutical composition comprising the compound of claim 1, wherein the compound is in the form of at least one physiologically tolerable metal salt or ester.