Butynylamine derivatives

Abstract: As a remedy for pollakiuria and other hyperactive bladder as well as other types of urinary incontinences exhibiting anti-cholinergic and calcium antagonistic actions have been found new butynylamine derivatives represented by the following general formula (I) and pharmacological acceptable salts thereof wherein R¹ and R² are the same or different cycloalkyl, phenyl or 2-thienyl group, R³ and R⁴ are the same or dif­ ferent hydrogen atom or an alkyl group, or together complete a cycloalkyl group in conjunction with the ad­ jacent carbon atoms; R⁵ and R⁶ are the same or different hydrogen atom or an alkyl group, or together complete a cyclic amino group in conjunction with the adjacent nitrogen atom; and A denotes O or NR (in which R is a hydrogen atom or an alkyl group), excluding the case in which R³ and R⁴ are both hydrogen atoms, A is O, and either one of R¹ and R² is phenyl.

Description: This invention relates to butynylamine derivatives represented by the following general formula (I) and pharmacologically acceptable salts thereof which exhibit anti-cholinergic and calcium antagonistic actions and are hence useful as a remedy for pollakiuria and other hyperactive bladder as well as other various types of urinary incontinences wherein R 1 and R 2 are same or different cycloalkyl, phenyl or 2-thienyl group; R 3 and R 4 are same or different an alkyl group, or together complete a cycloalkyl group in conjunction with the adjacent carbon atom; R 5 and R 6 are same or different hydrogen atom or an alkyl group, or together complete a cyclic amino group in conjuction with the adjacent nitrogen atom; and A denotes O or NR ( in which R is hydrogen atom or an alkyl group ) ( Prior Art ) Only flavoxate has been generally used as the remedy for pollakiuria, and there are very few medicines employed in this field. Only terolidine and oxybutynine have recently been put to the market to follow flavoxate. Of these, oxybutynine is akin to the compounds of this invention in structure, but it shows side effects such as thirst because of the too powerful anticholinergic action, providing a serious obstacle to medical treatment. ( Problems to be Solved by the Invention ) We have studied to find out compounds which exhibit better actions than the conventional remedies for pollakiuria and are free from the above-mentioned defects. ( Means to Solve the Problems ) The subject-matter of this invention consists in the chemical structure of the compounds of general formula (I). These are novel compounds which have not appeared in literature yet, and which show excellent therapeutical effects with low toxicity as described below. Explained below are these compounds of this invention in more detail. In the the general formula (I), the cycloalkyl group expressed as R 1 and R 2 should preferably be the one having 5 to 7 carbon atoms, such as cyclopentyl, cyclohexyl and cycloheptyl. The alkyl group expressed as R 3 and R 4 should preferably be a linear or branched alkyl group having 1 to 4 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl and tert-butyl. When R 3 and R 4 are taken together to form a cycloalkyl ring in conjunction with the adjacent carbon atom, said ring should preferably be a 5- or 6-membered ring. The alkyl group expressed as R 5 and R 6 should preferably be a linear or branched alkyl grout having 1 to 4 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl and tert-butyl. R 5 and R 6 may be taken together to form, in conjunction with the adjacent nitrogen atom, a cyclic amino group which may optionally contain sulfur and nitrogen atom as a member of the ring. As examples of such a cyclic amino group, may be mentioned pyrrolidino, piperidino, piperazino, thiomorpholino and homopiperazino groups. Morpholino is also included. These cyclic amino groups may also have an alkoxyphenyl radical as substituent group, said alkoxy radical being preferably the one having 1 to 4 carbon atoms, such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and tert-butoxy. The salts of the compounds of this invention include those with mineral acids, such as hydrochloric, sulfuric, nitric and phosphoric acids, and those with organic acids, such as oxalic, tartaric, maleic and benzenesulfonic acids. The compounds of this invention may be prepared, for example, by the following methods. Method A ( transesterification ) ( wherein R 1 through R 6 and A are as defined above; R 7 is a lower alkyl group; and R 8 is hydrogen atom or a lower alkanoyl group ). Compounds of formula (I) can be prepared by transesterification reaction between an ester or amide of formula (II) and a 2-butyne compound of formula (III) by the known method. For example, the reaction is carried out in an inert solvent in the presence of a base catalyst ( e.g., potassium or sodium alkoxides ) while removing the formed alcohol from the reaction system through a dehydration tube. When R 7 is methyl group, in particular, use of molecular sieves to selectively adsorb the formed methanol gives a high yield of compound (I). As the reaction medium, may be used any solvents commonly employed in this type of reaction, such as hydrocarbons ( e.g., benzene, toluene, n-pentane, n-hexane and petroleum ether ), ethers ( e.g., anhydrous diethyl ether, tetrahydrofuran, isopropyl ether, dioxane, dimethoxyethane, diethylene glycol and dimethyl ether ), and aprotic solvents ( e.g., acetonitrile, N,N-dimethylformamide and sulfolane ). The reaction temperature is in the range from 50 to 200 o C, preferably from 90 to 120 o C. The amount of compound (III) to be used is 1 to 2 molar proportions, preferably 1 to 1.2 molar proportions, based on the weight of compound (II). A high yield of compound (I) can also be prepared by the use of an acid catalyst (e.g., sulfuric and p-toluene-sulfonic acids ), if compound (III) is used in large excess, or a methyl ester is used as compound (II) to effectively remove the low-boiling methanol thus formed. Method B ( Grignard reaction ) ( wherein A and R 1 through R 6 are as defined above ). Compounds (I) may be prepared by reaction of a compound (IV) with a Grignard reagent (V) or a lithium compound (VI). The reaction is carried out in an inert solvent at a temperature in the range from -78 to 100 o C, preferably from -20 to 50 o C. The most preferred reaction medium is an ether solvent, such as anhydrous diethyl ether, tetrahydrofuran, isopropyl ether, dioxane, dimethoxyethane, diethylene glycol and dimethyl ether, but a hydrocarbon ( e.g., benzene, toluene, n-pentane, n-hexane and petroleum ether ) or an amine ( in some cases ) may also be used as solvent. The reaction is generally carried out by dissolving 1.0 to 0.8 equivalent proportion of a compound (IV) in a small volume of solvent and adding a Grignard reagent or a lithium compound to this solution. Method C ( Mannich reaction ) ( wherein A and R 1 through R 6 are as defined above ). Compounds (I) may also be prepared by Mannich reaction from a compound (VII) and a secondary amine (VIII), which is carried out in the presence of an aldehyde in a solvent inert to the reaction or without using any solvent. As the reaction medium, may be used any solvents commonly employed in this type of reaction, such as alcohols ( e.g., methanol, ethanol, propanol and butanol ), ethers ( e.g., tetrahydrofuran and dioxane ), aprotic solvents ( e.g., acetonitrile, N,N-dimethylforamide, dimethyl sulfoxide and sulfolane ), water, and mixtures thereof. As the aldehyde, may be used any compounds showing action equivalent to formaldehyde in Mannich reaction, such as paraformaldehyde, formalin, methylal, ethylal, piperidinomethylphthalimide and hexamethylenetetramine. The suitable amounts of aldehyde and secondary amine to be used are 1 to 10 molar proportions based on the weight of compound (VII). The secondary amine may also be used in the form of a salt. A catalytic amount ( 0.01 to 0.1 molar proportion ) of zinc chloride or a copper salt ( e.g., cuprous chloride and acetate ) may be added to the reaction system to accelerate the reaction. The reaction should normally be carried out at a temperature in the range from 0 to 100 o C. The suitable reaction time may vary with the types of reactants and aldehyde used, the reaction temperature and other factors, but is normally in the range from 20 minutes to 40 hours. Starting materials represented by the formula (III), (IV) and (VII) include novel compounds, which can be prepared by the known methods [ J. Org. Chem., 27 , 2905 ( 1962 ); J. Am. Chem. Soc., 71 , 3722 ( 1949 ); J. Med. Chem., 13 , 1249 ( 1970 ); Acta. Pharm. Suecica, 6 , 349 ( 1969 ); B.P. 1051723; U.S.P. 3202655 ] or according to the methods described in Reference Examples given later. The objective compounds (I) thus formed can be isolated and purified in the form of free base or an acid addition salt by known techniques, such as concentration, pH adjustment, extraction, crystallization, fractional distillation and chromatography. The compounds of this invention, when used as medicine, are administered to patients as such or in the form of a medical composition in which the active ingredient is contained in an amount of 0.1 to 99.5%, preferably 0.5 to 90%, together with a pharmaceutically acceptable carrier which is nontoxic and inactive. As the carrier, may be used at least one member selected from solid, semi-solid or liquid diluents, fillers, and other additives commonly used for pharmaceutical preparation. The medical composition thus prepared should preferably be administered in unit dosage, and can be applied by oral, in-tissue, local ( for example, subcutaneous ) or rectal administration in a suitable dosage form. Of these application types, the oral administration is the most preferred. The suitable dosage for the treatment of pollakiurea should be determined case by case with considerations given to the conditions of patient (e.g., age and body weight ), the administration route, the nature and severity of disease, and other factors, but is normally in the range from 1 to 100 mg/day, preferably from 1 to 10 mg/day, for humans. In some cases, however, an amount below the above lower limit suffices, or an amount over the upper limit must be administered. In addition, the daily amount may also be subdivided in 2-3 doses. ( Examples ) The following Reference Examples, Examples and Test Example will further illustrate the invention. Reference Example 1 ( methyl α,α-(2,2′-dithienyl)glycolate ) A Grignard reagent, prepared from 0.73 g magensium and 4.9 g 2-bromothiophene in anhydrous tetrahydrofuran ( THF ) in the usual way, was added dropwise under a nitrogen gas stream to a solution of 4.25 g methyl α-oxo-2-thiopheneacetate in anhydrous THF under ice cooling, and stirring was continued for two hours under cooling with water. A solution of 1.5 g ammonium chloride in 15 ml water was then added under ice cooling. The separated organic layer was collected, dried over anhydrous magnesium sulfate and concentrated under reduced pressure, leaving crystals of the objective compound. Recrystallization from a mixture of n-hexane and diethyl ether gave 3.5 g of pure crystals. M.p.: 92-93 o C. Reference Example 2 ( 1,1-dimethyl-2-propynyl α-cyclohexyl-α-phenylglycolate ) A Grignard reagent, prepared from 3.38 g magnesium and 2.27 g cyclohexyl bromide in anhydrous THF in the usual way, was added dropwise under a nitrogen gas stream to a solution of 1,1-dimethyl-2-propynyl benzoylformate in anhydrous THF under ice cooling, and stirring was continued for 18 hours under cooling with water. A solution of 7.5 g ammonium chloride in 30 ml water was then added under ice cooling. The separated organic layer was collected, washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The oily residue was purified by silica gel column chromatography ( Wako Gel C-200; 1:15 mixture of ethyl acetate and n-hexane ), giving 17.6 g of the objective compound as oil. IR ( film, cm -1 ): 3500, 3300, 2920, 2110, 1725, 1120 The following compounds were obtained in the same way as above. 1,1-Dimethyl-2-propynyl α-cyclopentyl-α-phenylglycolate IR ( film, cm -1 ): 3500, 2950, 1725, 1250, 1130, 695 1,1-Dimethyl-2-propynyl α-phenyl-α-(2-thienyl)glycolate IR ( film, cm -1 ): 3480, 1730, 1255, 1125, 695 1,1-Dimethyl-2-propynyl α,α-diphenylglycolate IR ( film, cm -1 ): 3500, 3295, 2110, 1725, 1125 1-Methyl-2-propynyl α-cyclohexyl-α-(2-thienyl)glycolate IR ( film, cm -1 ): 3500, 3300, 2940, 2110, 1725 1-Methyl-2-propynyl α-cyclopentyl-α-(2-thienyl)glycolate Elemental analysis ( C 15 H 18 O 3 S·1/10H 2 O ): Calcd. (%) C 64.30 H 6.54 Found (%) C 64.03 H 6.63 1,1-Dimethyl-2-propynyl α-cyclohexyl-α-(2-thienyl)glycolate IR ( film, cm -1 ): 3500, 3300, 2910, 2100, 1725, 1120 1,1-Dimethyl-2-propynyl α-cyclopentyl-α-(2-thienyl)glycolate IR ( film, cm -1 ): 3500, 3300, 2950, 2110, 1725, 1125 1-Ethynyl-1-cyclopentyl α-cyclohexyl-α-phenylglycolate 1-Ethynyl-1-cyclopentyl α-cyclopentyl-α-phenylglycolate 1-Ethynyl-1-cyclohexyl α-cyclohexyl-α-phenylglycolate 1-Ethynyl-1-cyclohexyl α-cyclopentyl-α-phenylglycolate 1-Ethynyl-1-cyclopentyl α-phenyl-α-(2-thienyl)glycolate 1-Ethynyl-1-cyclohexyl α-phenyl-α-(2-thienyl)glycolate N-(2-Propynyl)-2-hydroxy-2,2-(2,2′-dithienyl)acetamide M.p.: 128.0 o C N-(2-Propynyl)-2-cyclopentyl-2-hydroxy-2-(2-thienyl)acetamide IR ( film, cm -1 ): 3390, 3300, 2300, 1665, 1515 N-(2-Propynyl)-2-cyclohexyl-2-hydroxy-2-(2-thienyl)acetamide M.p.: 134-135 o C N-(2-Propynyl)-2-cyclohexyl-2-hydroxy-2-phenylacetamide M.p.: 142.5-143 o C Reference Example 3 ( 4-diethylamino-1-methyl-2-butynyl α-oxo-2-thiopheneacetate ) To a solution of 4.3 g α-oxo-2-thiopheneacetic acid in dichloromethane was added 0.5 ml pyridine, and 6.75 g thionyl chloride was then added dropwise under ice cooling. The mixture was heated under reflux for seven hours and concentrated under reduced pressure, diethyl ether was added to the residue, the insoluble matters were filtered off, and the filtrate was concentrated under reduced pressure. The oily substance thus obtained ( 4.1 g ) was added dropwise to an etheral solution of 4.5 g 5-diethylamino-3-pentyn-2-ol under ice cooling, and the mixture was stirred for 18 hours under cooling with water and basified with an aqueous solution of potassium carbonate. The separated etheral layer was collected, washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The oily residue was purified by silica gel column chromatography ( Wako Gel C-200; ethyl acetate ), giving 2.48 g of the objective compound as oil. IR ( film cm -1 ): 1735, 1665, 1410, 1195 The following compound was prepared in the same way as above: 4-Diethylamino-2-butynyl α-oxo-2-thiopheneacetate IR ( film, cm -1 ): 1735, 1660, 1410, 1185 Reference Example 4 ( N-(4-diethylamino-2-butynyl)benzoylformamide ) N-(2-propynyl)benzoylformamide ( 0.36 g ), 80% paraformaldehyde ( 90 mg ) and diethylamine ( 162 mg ) were added to anhydrous dioxane, 4 mg cuprous chloride was further added, and the mixture was heated at 70 to 80 o C for 1.5 hours with stirring. After cooling to room temperature, the reaction mixture was acidified with 5% hydrochloric acid. The separated aqueous layer was collected and washed with diethyl ether, 5% aqueous solution of caustic soda was added under ice cooling to make the solution weakly alkaline, and the alkaline solution was extracted with diethyl ether. The etheral extract was washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The oily residue thus obtained was purified by silica gel column chromatography ( Wako Gel C-200; chloroform ), giving 0.39 g of the objective compound. IR: 3300, 1690, 1665, 1215 Reference Example 5 ( 4-bromo-1,1-dimethyl-2-butynyl α-cyclohexyl-α-phenylglycolate ) To a solution of 9.5 g 4-diethylamino-1,1-dimethyl-2-butynyl α-cyclohexyl-α-phenylglycolate in diethyl ether, was added dropwise an etheral solution of 3.2 g cyanogen bromide, and the mixture was stirred for one hour under ice cooling and then for 18 hours under cooling with water. 2N-HCl ( 14 ml ) was added to the reaction mixture under ice cooling, and the separated etheral layer was collected, washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue left was purified by silica gel column chromatography ( Wako Gel C-200; 1:15 mixture of ethyl acetate and n-hexane ), giving 6.0 g of the objective compound as colorless oil. IR ( film, cm -1 ): 3500, 2920, 1725, 1270, 1250, 1235, 1120 Example 1 ( 4-diethylamino-2-butynyl α,α-(2,2′-dithienyl)glycolate hydrochloride ) To a suspension of 37 mg newly prepared sodium methoxide in n-heptane, were added 1.09 g 4-diethylamino-2-butynol and 1.78 g methyl α,α-(2,2′-dithienyl)glycolate, and the mixture was heated under reflux for six hours while removing the formed methanol through a dehydration tube. Ice and ethyl acetate were added to the reaction mixture in that order, the separated organic layer was collected, washed thrice with water and dried over anhydrous sodium sulfate, and the solvents were distilled off from the dried solution, leaving 2.6 g of dark-red oil. It was purified by column chromatography ( silica gel 30 g; 100:1 to 10:1 mixtures of chloroform and methanol ), giving 1.6 g of the objective compound as dark-red oil. It was dissolved in diethyl ether and converted to hydrochloride by addition of etheral solution of hydrogen chloride, which was recrystallized from a mixture of ethanol and diethyl ether, giving 1.18 g of the hydrochloride of objective compound as faint-yellow powder. M.p.: 138.5-140 o C. Elemental analysis ( C 18 H 21 NO 3 S 2 ·HCl ): Calcd. (%) C 54.05 H 5.54 N 3.50 Found (%) C 53.97 H 5.53 N 3.37 Example 2 ( 4-[4-(2-methoxyphenyl)-1-piperazinyl]-2-butynyl α,α-(2,2′-dithienyl)glycolate ) Sodium methoxide ( 54 mg ) prepared from 22 mg sodium and anhydrous methanol, 1.6 g methyl α,α-(2,2′-dithienyl)glycolate and 2.1 g 4-[4-(2-methoxyphenyl)-1-piperazinyl]-2-butynyl acetate were added to n-heptane, and the mixture was heated under reflux for 18 hours while removing the formed methyl acetate through a dehydration tube. Ice water was added to the reaction mixture, the separated organic layer was collected and extracted with 10% hydrochloric acid, and the acidic aqueous extract was washed with diethyl ether, basified with 10% aqueous solution of caustic soda and extracted with diethyl ether. The ethereal extract was washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure, and the residue was purified by flash column chromatography ( Kieselgel 60H ). The oily product thus obtained crystallized when allowed to stand. Recrystallization from a mixture of ethyl acetate and n-hexane gave 0.49 g of the objective compound as white powder. M.p.: 113-114 o C. Elemental analysis ( C 25 H 26 N 2 O 4 S 2 ): Calcd. (%) C 62.22 H 5.43 N 5.80 Found (%) C 62.27 H 5.55 N 5.71 Example 3 ( 4-diethylamino-1-methyl-2-butynyl α,α-(2,2′-dithienyl)glycolate ) A solution of Grignard reagent in anhydrous diethyl ether prepared from 1.5 g 2-bromothiophene and 223 mg magnesium in the usual way was added dropwise to a solution of 4-diethylamino-1-methyl-2-butynyl α-oxo-2-thiopheneacetate in anhydrous diethyl ether at -10 to -15 o C under a nitrogen gas stream, and the mixture was stirred at that temperature for three hours. A solution of 492 mg ammonium chloride in 6 ml water was then added at that temperature, and the separated ethereal layer was collected. The aqueous layer was extracted with diethyl ether, the extract was joined to the above ethereal layer, the combined solution was washed with water and dried over anhydrous magnesium sulfate, and the solvent was distilled off from the dried solution under reduced pressure. The residue was subjected to flash column chromatography ( Kieselgel 60H; 20:1 mixture of chloroform and methanol ), followed by development with a 100:1 mixture of chloroform and methanol. The product thus obtained was recrystallized from a mixture of petroleum ether and diethyl ether, giving 1.47 g of the objective compound as white powder. M.p.: 65.5-66 o C. Elemental analysis ( C 19 H 23 NO 3 S 2 ): Calcd. (%) C 60.45 H 6.14 N 3.71 Found (%) C 60.20 H 6.10 N 3.98 Example 4 ( 4-diethylamino-1,1-dimethyl-2-butynyl α-cyclohexyl-α-phenylglycolate hydrochloride ) 1,1-Dimethyl-2-propynyl α-cyclohexyl-α-phenylglycolate ( 9.4 g ), 90% paraformaldehyde ( 2.1 g ) and cuprous chloride ( 62 mg ) were added to 40 ml anhydrous dioxane, and the mixture was heated on an oil bath of 60 o C with stirring. A solution of 2.5 g diethylamine in 10 ml anhydrous dioxane was then added dropwise over a period of 45 minutes, and stirring was continued for four hours at that temperature. After cooling to room temperature, the insoluble matters were filtered off from the reaction mixture, and the filtrate was concentrated under reduced pressure. The residue left was dissolved in isopropyl ether, 18 ml of 2N-HCl was added to the solution, and the crystals which separated out were collected by filtration and thoroughly washed with isopropyl ether. The hydrochloride thus obtained was dissolved in chloroform, and the solution was washed with ice water, basified with saturated aqueous solution of sodium bicarbonate, again washed with water and dried over anhydrous magnesium sulfate. The dried solution was concentrated under reduced pressure, and the oily substance left was purified by flash column chromatography ( Kieselgel 60H; 4:6 mixture of ethyl acetate and n-hexane ), giving the objective compound. It was dissolved in diethyl ether and converted to hydrochloride by addition of 15% etheral solution of hydrogen chloride under ice cooling, which was recrystallized from ethyl acetate, giving 9.0 g of pure hydrochloride as colorless prisms. M.p.: 158-160 o C. Elemental analysis ( C 24 H 35 NO 3 ·HCl ): Calcd. (%) C 68.31 H 8.60 N 3.32 Found (%) C 68.19 H 8.78 N 3.31 Example 5 ( 4-diethylamino-2-butynyl α-cyclohexyl-α-(2-thienyl)glycolate hydrochloride ) 2-Propynyl α-cyclohexyl-α-(2-thienyl)glycolate ( 840 mg ), 80% paraformaldehyde ( 136 mg ), diethylamine ( 265 mg ) and cuprous chloride ( 17 mg ) were added to anhydrous dioxane, and the mixture was heated at 80 o C for one hour with stirring. After cooling to room temperature, dioxane was distilled off from the reaction mixture under reduced pressure, water was added to the residue, and the resulting mixture was extracted with chloroform. The extract was washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatrography ( Wako Gel C-200; chloroform / 50:1 ) giving the objective compound as oil. It was converted to hydrochloride by addition of etheral solution of hydrogen chloride, which was recrystallized from a mixture of ethanol, diethyl ether and n-hexane, giving 0.443 g of pure hydrochloride as colorless powder. M.p.: 119.5 o C ( dec. ) Elemental analysis ( C 20 H 29 NO 3 S·HCl ): Calcd. (%) C 60.06 H 7.56 N 3.50 Found (%) C 59.76 H 7.76 N 3.67 Example 6 ( N-(4-N',N'-diethylamino-2-butynyl)-2-cyclohexyl-2-hydroxy-2-phenylacetamide ) A Grignard reagent, prepared from 510 mg magnesium and 2.5 g cyclohexyl chloride in anhydrous THF in the usual way, was added dropwise under a nitrogen gas stream to a solution of 2.5 g N-(4-N',N'-diethylamino-2-butynyl)benzoylformamide in anhydrous THF under ice cooling, and stirring was continued at room temperature for 18 hours A solution of 1.12 g ammonium chloride in 15 ml water was then added under ice cooling. The separated organic layer was collected, washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure, and the residue was purified by flash column chromatography ( Kieselgel 60H ). The oily product thus obtained crystallized when allowed to stand. Recrystallization from a mixture of diethyl ether and petroleum ether gave 0.74 g of pure product as white powder. M.p. 105-105.5 o C Elemental analysis ( C 22 H 32 N 2 O 2 ): Calcd. (%) C 74.12 H 9.05 N 7.86 Found (%) C 74.18 H 9.12 N 7.75 Example 7 ( 1,1-dimethyl-4-(1-pyrrolidinyl)-2-butynyl α-cyclopentyl-α-phenylglycolate hydrochloride ) A solution of 90% paraformaldehyde ( 243 mg ) and pyrrolidine ( 440 mg ) in anhydrous dioxane was heated at 80 o C for one hour with stirring, 1.6 g 1,1-dimethyl-2-propynyl α-cyclopentyl-α-phenylglycolate was then added, and the mixture was heated at 100 o C for 18 hours. The reaction mixture was concentrated under reduced pressure, the residue was dissolved in isopropyl ether, and the solution was washed with water and extracted with 5% hydrochloric acid . The acidic aqueous extract was washed with diethyl ether and extracted with chloroform, and the extract was washed with ice water and treated with saturated aqueous solution of sodium bicarbonate. The separated organic layer was collected, washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure, and the oily residue was purified by flash column chromatography ( Kieselgel 60H; a mixture of 40% ethyl acetate and n-hexane ). The oily product thus obtained was converted to hydrochloride by addition of 20% ethereal solution of hydrogen chloride, which was recrystallized from a mixture of ethyl acetate and acetone, giving 1.37 g of pure hydrochloride as colorless rods. M.p. 167-168 o C. Elemental analysis ( C 23 H 31 NO 3 ·HCl ): Calcd. (%) C 68.05 H 7.95 N 3.45 Found (%) C 67.84 H 7.93 N 3.36 Example 8 ( 4-ethylamino-1,1-dimethyl-2-butynyl α-cyclohexyl-α-phenylglycolate hydrochloride ) To a solution of 6.0 g 4-bromo-1,1-dimethyl-2-butynyl α-cyclohexyl-α-phenylglycolate in benzene, was added dropwise a solution of 8.2 g ethylamine in benzene over a period of one hour under ice cooling, and stirring was continued for 18 hours. The reaction mixture was washed with water and then with saturated aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The oily residue was purified by column chromatography ( Wako Gel C-200; 2:1 mixture of ethyl acetate and n-hexane ), and the oily product thus obtained was dissolved in isopropyl ether and converted to hydrochloride by addition of 15% ethereal solution of hydrogen chloride. Recrystallization from a mixture of ethanol and ethyl acetate gave 3.6 g of pure hydrochloride as colorless prisms. M.p. 158-160 o C. Elemental analysis ( C 22 H 31 NO 3 ·HCl ): Calcd. (%) C 67.07 H 8.19 N 3.56 Found (%) C 66.75 H 8.25 N 3.75 The following compounds were prepared in the same way as above: Example 9 ( 4-(1-pyrrolidinyl)-2-butynyl α,α-(2,2'-dithienyl)glycolate M.p.: 128-129 o C Elemental analysis ( C 18 H 19 NO 3 S 2 ): Calcd. (%) C 59.81 H 5.30 N 3.87 Found (%) C 59.84 H 5.41 N 3.94 Example 10 ( 4-morpholino-2-butynyl α,α-(2,2'-dithienyl)-glycolate M.p.: 113-115 o C Elemental analysis ( C 18 H 19 NO 4 S 2 ): Calcd. (%) C 57.27 H 5.07 N 3.71 Found (%) C 57.07 H 5.29 N 3.71 Example 11 ( 4-piperidino-2-butynyl α,α-(2,2'-dithienyl)-glycolate M.p.: 140-141 o C Elemental analysis ( C 19 H 21 NO 3 S 2 ): Calcd. (%) C 60.77 H 5.64 N 3.73 Found (%) C 61.07 H 5.96 N 3.70 Example 12 ( 1-methyl-4-(1-pyrrolidinyl)-2-butynyl α,α-(2,2'-dithienyl)glycolate M.p.: 106-107 o C Elemental analysis ( C 19 H 21 NO 3 S 2 ): Calcd. (%) C 60.77 H 5.64 N 3.73 Found (%) C 60.70 H 5.78 N 3.75 Example 13 ( 4-diethylamino-1-methyl-2-butynyl α-cyclohexyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 156-159 o C ( dec. ) Elemental analysis ( C 21 H 31 NO 3 S·HCl·3/4H 2 O ): Calcd. (%) C 58.99 H 7.89 N 3.28 Found (%) C 59.17 H 7.85 N 3.44 Example 14 ( 4-diethylamino-1,1-dimethyl-2-butynyl α-cyclohexyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 191-192 o C Elemental analysis ( C 22 H 33 NO 3 S·HCl ): Calcd. (%) C 61.73 H 8.01 N 3.27 Found (%) C 61.51 H 7.99 N 3.33 Example 15 ( 1,1-dimethyl-4-(1-pyrrolidinyl)-2-butynyl α-cyclohexyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 164-165 o C Elemental analysis ( C 22 H 31 NO 3 S·HCl ): Calcd. (%) C 62.03 H 7.57 N 3.29 Found (%) C 61.92 H 7.56 N 3.29 Example 16 ( 4-diethylamino-2-butynyl α-cyclopentyl-α-(2-thienyl)glycolate ) M.p.: 55-57 o C Elemental analysis ( C 19 H 27 NO 3 S ): Calcd. (%) C 65.30 H 7.79 N 4.01 Found (%) C 65.20 H 8.07 N 4.12 Example 17 ( 4-diethylamino-1,1-dimethyl-2-butynyl α-cyclopentyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 155-156 o C Elemental analysis ( C 21 H 31 NO 3 S·HCl·1/4H 2 O ): Calcd. (%) C 60.26 H 7.82 N 3.34 Found (%) C 60.38 H 7.86 N 3.60 Example 18 ( N-(4-N',N'-diethylamino-2-butynyl)-2-hydroxy-2,2-(2,2'-dithienyl)acetamide ) M.p.: 98-100 o C Elemental analysis ( C 18 H 22 N 2 O 2 S 2 ): Calcd. (%) C 59.64 H 6.12 N 7.73 Found (%) C 59.58 H 6.14 N 7.59 Example 19 ( N-(4-N',N'-diethylamino-2-butynyl)-2-cyclohexyl-2-hydroxy-2-(2-thienyl)acetamide ) M.p.: 77-78 o C Elemental analysis ( C 20 H 30 N 2 O 2 S ): Calcd. (%) C 66.26 H 8.34 N 7.73 Found (%) C 66.12 H 8.59 N 7.65 Example 20 ( N-(4-N',N'-diethylamino-2-butynyl)-2-cyclopentyl-2-hydroxy-2-(2-thienyl)acetamide hydrochloride ) M.p.: 131-132 o C Elemental analysis ( C 19 H 28 N 2 O 2 S·HCl ): Calcd. (%) C 59.28 H 7.59 N 7.28 Found (%) C 59.03 H 7.74 N 7.33 Example 21 ( N-(4-pyrrolidino-2-butynyl)-2-hydroxy-2,2-(2,2'-dithienyl)acetamide ) M.p.: 164-166 o C Elemental analysis ( C 18 H 20 N 2 O 2 S 2 ): Calcd. (%) C 59.97 H 5.59 N 7.77 Found (%) C 59.72 H 5.87 N 7.70 Example 22 ( N-(4-pyrrolidino-2-butynyl)-2-cyclohexyl-2-hydroxy-2-phenylacetamide ) M.p.: 112-114 o C Elemental analysis ( C 22 H 30 N 2 O 2 ): Calcd. (%) C 74.54 H 8.53 N 7.90 Found (%) C 74.16 H 8.68 N 7.84 Example 23 ( 4-diethylamino-1-methyl-2-butynyl α-cyclohexyl-α-phenylglycolate hydrochloride ) M.p.: 80-82 o C Elemental analysis ( C 23 H 33 NO 3 ·HCl·1/4H 2 O): Calcd. (%) C 64.17 H 8.54 N 3.25 Found (%) C 64.39 H 8.46 N 3.31 Example 24 ( 1,1-dimethyl-4-(1-pyrrolidinyl)-2-butynyl α-cyclohexyl-α-phenylglycolate hydrochloride ) M.p.: 174-175 o C Elemental analysis ( C 24 H 33 NO 3 ·HCl ) Calcd. (%) C 68.64 H 8.16 N 3.33 Found (%) C 68.40 H 8.04 N 3.26 Example 25 ( 1,1-dimethyl-4-dimethylamino-2-butynyl α-cyclohexyl-α-phenylglycolate hydrochloride ) M.p.: 155-159 o C Elemental analysis ( C 22 H 31 NO 3 ·HCl·1/2H 2 O ) Calcd. (%) C 65.57 H 8.25 N 3.48 Found (%) C 65.44 H 8.32 N 3.50 Example 26 ( 1,1-dimethyl-4-morpholino-2-butynyl α-cyclohexyl-α-phenylglycolate hydrochloride ) M.p.: 186-190 o C Elemental analysis ( C 24 H 33 NO 4 ·HCl ) Calcd. (%) C 66.12 H 7.86 N 3.21 Found (%) C 65.91 H 7.94 N 3.22 Example 27 ( 1,1-dimethyl-4-piperidino-2-butynyl α-cyclohexyl-α-phenylglycolate hydrochloride ) M.p.: 207-208 o C Elemental analysis ( C 25 H 35 NO 3 ·HCl ) Calcd. (%) C 68.79 H 8.44 N 3.31 Found (%) C 69.18 H 8.36 N 3.23 Example 28 ( 4-diethylamino-1,1-dimethyl-2-butynyl α-cyclopentyl-α-phenylglycolate hydrochloride ) M.p.: 120-121 o C Elemental analysis ( C 23 H 33 NO 3 ·HCl·1/4H 2 O ) Calcd. (%) C 66.97 H 8.43 N 3.40 Found (%) C 67.08 H 8.39 N 3.40 Example 29 ( 1,1-dimethyl-4-piperidino-2-butynyl α-cyclopentyl-α-phenylglycolate hydrochloride ) M.p.: 157-158 o C Elemental analysis ( C 24 H 33 NO 3 ·HCl·1/4H 2 O ) Calcd. (%) C 67.91 H 8.19 N 3.30 Found (%) C 67.90 H 8.38 N 3.21 Example 30 ( 1,1-dimethyl-4-dimethylamino-2-butynyl α-cyclopentyl-α-phenylglycolate hydrochloride ) M.p.: 125-127 o C Elemental analysis ( C 21 H 29 NO 3 ·HCl·1/2H 2 O ) Calcd. (%) C 64.85 H 8.03 N 3.60 Found (%) C 65.01 H 8.20 N 3.62 Example 31 ( 1,1-dimethyl-4-morpholino-2-butynyl α-cyclopentyl-α-phenylglycolate hydrochloride ) M.p.: 150-151 o C Elemental analysis ( C 23 H 31 NO 4 ·HCl·1/4H 2 O ) Calcd. (%) C 64.78 H 7.68 N 3.28 Found (%) C 65.07 H 7.75 N 3.27 Example 32 ( 1-(3-diethylamino-1-propynyl)cyclopentyl α-cyclopentyl-α-phenylalycolate hydrochloride ) M.p.: 132-133 o C Elemental analysis ( C 25 H 35 NO 3 ·HCl·1/4H 2 O): Calcd. (%) C 68.47 H 8.39 N 3.19 Found (%) C 68.56 H 8.42 N 3.27 Example 33 ( 1-(3-diethylamino-1-propynyl)cyclohexyl α-cyclopentyl-α-phenylglycolate hydrochloride ) M.p.: 113-115 o C Elemental analysis ( C 26 H 37 NO 3 ·HCl·1/4H 2 O ): Calcd. (%) C 69.00 H 8.57 N 3.10 Found (%) C 69.14 H 8.65 N 3.14 Example 34 ( 4-diethylamino-1,1-dimethyl-2-butynyl α-phenyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 155-156 o C Elemental analysis ( C 22 H 27 NO 3 S·HCl ) Calcd. (%) C 62.62 H 6.69 N 3.32 Found (%) C 62.41 H 6.78 N 3.37 Example 35 ( 1,1-dimethyl-4-(1-pyrrolidinyl)-2-butynyl α-phenyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 129-130 o C Elemental analysis ( C 22 H 25 NO 3 S·HCl·1/5H 2 O ) Calcd. (%) C 62.38 H 6.04 N 3.30 Found (%) C 62.48 H 6.12 N 3.35 Example 36 ( 1-(3-diethylamino-1-propynyl)cyclopentyl α-phenyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 149-151 o C Elemental analysis ( C 24 H 29 NO 3 S·HCl ) Calcd. (%) C 64.34 H 6.75 N 3.13 Found (%) C 64.09 H 6.81 N 3.15 Example 37 ( 1-[3-(1-pyrrolidinyl)-1-propynyl]cyclopentyl α-phenyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 133-135 o C Elemental analysis ( C 24 H 27 NO 3 S·HCl ) Calcd. (%) C 64.63 H 6.33 N 3.14 Found (%) C 64.35 H 6.57 N 3.18 Example 38 ( 1-(3-diethylamino-1-propynyl)cyclohexyl α-phenyl-α-(2-thienyl)glycolate hydrochloride ) M.p.: 120-121 o C Elemental analysis ( C 25 H 31 NO 3 S·HCl ) Calcd. (%) C 64.99 H 6.98 N 3.03 Found (%) C 64.99 H 6.93 N 3.00 Example 39 ( 4-diethylamino-1,1-dimethyl-2-butynyl α,α-diphenylglycolate hydrochloride ) M.p.: 176-177 o C Elemental analysis ( C 24 H 29 NO 3 ·HCl ) Calcd. (%) C 69.30 H 7.27 N 3.37 Found (%) C 69.09 H 7.43 N 3.44 Example 40 ( 1,1-dimethyl-4-(1-pyrrolidinyl)-2-butynyl α,α-diphenylglycolate hydrochloride ) M.p.: 144-146 o C Elemental analysis ( C 24 H 27 NO 3 ·HCl·1/10H 2 O): Calcd. (%) C 69.34 H 6.84 N 3.37 Found (%) C 69.07 H 6.81 N 3.42 Example 41 ( 1-(3-diethylamino-1-propynyl)cyclohexyl α-cyclohexyl-α-phenylglycolate hydrochloride ) M.p.: 132-134 o C Elemental analysis ( C 27 H 39 NO 3 ·HCl·1/4H 2 O): Calcd. (%) C 69.50 H 8.75 N 3.00 Found (%) C 69.47 H 8.69 N 3.13 Example 42 ( 1-(3-diethylamino-1-propynyl)cyclohexyl α-cyclopentyl-α-phenylglycolate hydrochloride ) M.p.: 172-173 o C Elemental analysis ( C 26 H 37 NO 3 ·HCl ) Calcd. (%) C 69.70 H 8.55 N 3.13 Found (%) C 69.56 H 8.62 N 3.09 Test Example Shown below is the result of pharmacological tests illustrating the efficacy of a typical example of the compounds of this invention. Test methods 1. Action upon detrusor muscles of excised rabbit bladder The bladder was extracted from JW/NIBUS/RABITON rabbits ( male; 2 to 3 kg ) and incised along longitudinal muscles, thus preparing specimens 2 to 3 mm wide and 10 mm long. Each of the specimens was suspended under a load of 1 gr in a Magnus bath filled with Modified Krebs' solution ( 37±0.1 o C; aerated with mixed gas ). (1) Anticholinergic action The specimens were contracted by carbachol cumulation, and a reaction curve with respect to carbachol concentration was obtained. Similar experiments were conducted with rabbits treated with drugs being tested, and pA 2 values were calculated according to the method of Arunlakshana and Shild. (2) Ca ++ Antagonism The solution in Magnus bath was replaced by Ca ++ -free, high KCl-modified Krebs' solution, the specimens were contracted by cumulation of calcium chloride, and a reaction curve with respect to calcium chloride concentration was obtained. Similar experiments were conducted with rabbits treated with drugs being tested, and pA 2 values were calculated according to the method of Arunlakshana and Shild. The result obtained is shown in Table 1. The compound of Example 4 showed weaker anticholinergic action ( 1/17 ) and higher Ca ++ antagonism ( 8.3 times as high ), compared with oxybutynine. 2. Action upon the rhythmic contraction of rat bladder Urethane-anesthetized SD rats ( male ; 280 to 360 g ) were used as test animals in this test. A small incision was made at the top of each bladder, a baloon was inserted through the cut, warm water of about 37 o C was injected into the baloon at a constant internal pressure, and the urinating contraction of rhythmic amplitude was recorded. When the frequency of contraction reached a constant level, a drug being tested was cumulatively administered ( i.v. ) to test its effect upon the contraction. The result obtained is summarized in Table 2. The compound of Example 4 showed dose-dependent action to suppress the contraction at doses of 0.1 mg/Kg ( i.v. ) and higher, while no such action was observed with oxybutynine. 3. Acute toxicity ddY-Mice ( male; 6 to 7 week age ) were used as test animals ( each group consisting of four mice ). Each of the mice was fasted from the previous day ( 16 to 18 hours before ), a drug being tested was orally administered by using a probe, and LD 50 value was calculated from the mortality one week later according to the method of Weil. The LD 50 value for the compound of Example 4 was 841 mg/kg ( p.o. ) ― a far lower toxicity level than that of oxybutynine having a LD 50 value of 354 mg/kg ( p.o. ). 4. Concentration of unchanged drug in the serum A drug being tested was administered to an SD rat ( male; 280 to 360 g ) in a dose of 3 mg/kg ( i.v. ), blood samples were taken out at predetermined intervals, and the change in the concentration of said drug left unchanged in the serum was measured. The half-life period ( t 1/2 ) of the compound of Example 4 was 0.85 hour ( far longer than the value of oxybutynine, 0.28 hour ), indicating its longer duration. Action upon Detrusor Muscles of Excised Rabbit Bladder pA 2 value Anticholinergic action Ca ++ Antagonism Compd. of Example 4 7.33 6.72 Oxybutynine 8.56 5.80 (Effects Achieved by the Invention) As may be apparent from the foregoing, the compounds of this invention show weaker anticholinergic action and stronger antagonism against calcium as compared with oxybutynine, and hence are characterized by an ideal balance between the two actions, thereby exhibiting excellent therapeutical effects against pollakiuria and other hyperactive bladder as well as other various types of urinary incontinences. In addition, the half-life period in the serum is very long, indicating the long duration, and the toxicity is also very low. Because of the excellent actions, long duration and low toxicity not observed with the conventional drugs, the compounds of this invention can be used as drugs of high safety for treating pollakiuria and various types of incontinences caused by neurogenic bladder, bladder contracture, nervous cystitis and enuresis which require long-term administration.

Claims: Butynylamine derivatives represented by the following general formula (I) and pharmacologically acceptable salts thereof, wherein R 1 and R 2 are same or different cycloalkyl, phenyl or 2-thienyl group; R 3 and R 4 are same or different alkyl group, or together complete a cycloalkyl group in conjunction with the adjacent carbon atom; R 5 and R 6 are same or different hydrogen atom or an alkyl group, or together complete a cyclic amino group in conjuction with the adjacent nitrogen atom; and A denotes O or NR ( in which R is hydrogen atom or an alkyl group ). (4-diethylamino-1,1-dimethyl-2-butynyl α-cyclo-hexyl-α-phenylglycolate hydrochloride. (4-diethylamino-1-methyl-2-butynyl α-cyclohexyl-α-phenylglycolate hydrochloride. Butynylamine derivatives and the pharmacologically acceptable salts thereof of claim 1 for use as a medicament for treating pollakiuria and other hyperactive bladder as well as other various types of urinary incontinences.

Inventors: KIMURA KIYOSHI, KISE MASAHIRO, MORITA IWAO, KIMURA, KIYOSHI, KISE, MASAHIRO, MORITA, IWAO
Applicants: NIPPON SHINYAKU CO LTD, NIPPON SHINYAKU COMPANY, LIMITED
Application year: 1989
Main classification: C07D333
IPC codes: C07C219, C07C235, C07D333, C07D295