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Pyrrolothiazine and pyrrolothiazephine compounds having serotonin-2 receptor antagonistic and alpha-1-blocking action

a technology of serotonin-2 receptor and pyrrolothiazephine, which is applied in the field of pyrrolesulfonamide derivatives, can solve the problems of many problems accompanied by the antagonistic action of the serotonin-2 receptor, and achieve the effects of strong serotonin-2 receptor antagonistic action, low toxicity and less side effects

Inactive Publication Date: 2005-02-17
ASUBIO PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0005] In view of the foregoing circumstances, the present inventors have proceeded with extensive research toward compounds which have strong serotonin-2 receptor antagonistic action and low toxicity and less side effects and are useful for the treatment and prevention of ischemic heart diseases, cerebrovascular disturbances and peripheral circulatory disturbances. As a result, it has been found that pyrrolesulfonamides represented by the below-described formula (I) meet the above conditions. It has also been found that the compounds according to the present invention include those also having α1-blocking action in combination and that such compounds are useful as antihypertensives or the like having less side effects and are widely usable for the treatment and prevention of circulatory diseases.
[0128] The pyrrolesulfonamide derivatives (I) and their salts, which are obtained as described above, have strong serotonin-2 blocking action as will be demonstrated in tests to be described subsequently herein. Moreover, the compounds (I) according to the present invention have also been found to include those also having α1 blocking action. From the results of toxicity tests, the compounds (I) according to the present invention have also been found to possess high safety.

Problems solved by technology

Those known to have serotonin-2 receptor antagonistic action are accompanied with many problems to be improved in potency, toxicity, side effects or the like.

Method used

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  • Pyrrolothiazine and pyrrolothiazephine compounds having serotonin-2 receptor antagonistic and alpha-1-blocking action
  • Pyrrolothiazine and pyrrolothiazephine compounds having serotonin-2 receptor antagonistic and alpha-1-blocking action
  • Pyrrolothiazine and pyrrolothiazephine compounds having serotonin-2 receptor antagonistic and alpha-1-blocking action

Examples

Experimental program
Comparison scheme
Effect test

referential example 1

[0135] Synthesis of sodium 3-pyrrolesulfonate (Compound 1)

[0136] A mixture consisting of 30.0 g (447 mmol) of pyrrole, 75.0 g (471 mmol) of sulfur trioxide-pyridine complex and 250 ml of 1,2-dichloroethane was refluxed for 16 hours. The top layer of the reaction mixture was removed by decantation. To the residue, 150 ml of water and 30 g of sodium carbonate were added successively. After the resulting mixture was boiled, the solvent was distilled off under reduced pressure. Ethanol-water (9:1 v / v, 500 ml) was added to the residue, followed by reflux for 1 hour. The reaction mixture was subjected to hot filtration, and the filtrate was allowed to cool down. Precipitated crystals were collected, washed with chilled ethanol and diethyl ether, and then dried under reduced pressure, whereby 17.0 g of powdery crystals were obtained.

referential example 2

[0137] Synthesis of Benzyl 2-(3-pyrrolesulfonamide)acetate (Compound 2)

[0138] A suspension of 16.9 g (100 mmol) of Compound 1 and 22.9 g (110 mmol) of phosphorus pentachloride in 750 ml of diethyl ether was stirred at room temperature for 2 hours, and was then refluxed for 4 hours. After the reaction mixture was allowed to cool down, it was filtered. The filtrate was washed successively with ice water (twice), a chilled, saturated aqueous solution of sodium hydrogencarbonate, ice water and a chilled, saturated aqueous solution of sodium chloride. The organic layer was dried over anhydrous sodium sulfate and then concentrated under reduced pressure, whereby 11.2 g of 3-pyrrolesulfonyl chloride were obtained as crude crystals.

[0139] After a mixture consisting of the whole amount of the thus-obtained crude crystals, 32.6 g (96.6 mmol) of glycine benzyl ester p-toluenesulfonate, 19.6 g (193 mmol) of triethylamine and 250 ml of tetrahydrofuran (hereinafter called “THF”) was refluxed f...

referential example 3

[0140] Synthesis of Benzyl 3-(3-pyrrolesulfonamide)propionate (Compound 3)

[0141] A mixture consisting of 1.66 g (10 mmol) of 3-pyrrolesulfonyl chloride obtained by the process of Referential Example 2, 7.03 g (20 mmol) of β-alanine benzyl ester p-toluenesulfonate, 4.05 g (40 mmol) of triethylamine and 100 ml of THF was refluxed for 16 hours. The reaction mixture was concentrated under reduced pressure, and ethyl acetate was added to the residue. The organic layer was washed successively with a saturated aqueous solution of sodium hydrogencarbonate, water, a 10% aqueous solution of citric acid, water and a saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (Merck & Co. Inc. No. 9385) (the same silica gel were used in the subsequent examples) (eluent: ethyl acetate / hexane=1 / 1), whereby 2.82 g of the title compound were obtained-(yield: 92%)....

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Abstract

Abstract of the Disclosure A pyrrolesulfonamide derivative, Compound (I), which has strong serotonin-2 receptor antagonistic action and low toxicity and less side effects, and is useful as a therapeutic for circulatory diseases such as ischemic heart diseases, cerebrovascular disturbances and peripheral circulatory disturbances.

Description

Detailed Description of the InventionTECHNICAL FIELD[0001] This invention relates to novel pyrrolesulfonamide derivatives. More specifically, this invention is concerned with pyrrolo[2,3-e][1,2]thiazine derivatives, pyrrolo[3,4-e][1,2]thiazine derivatives, pyrrolo[2,3-f][1,2]thiazepine derivatives and pyrrolo-[3,4-f][1,2]thiazepine derivatives, and salts thereof, said derivatives and salts having strong serotonin-2 receptor antagonistic action of excellent selectivity and being useful, for example, for the prevention or treatment of ischemic heart diseases such as angina pectoris, arrhythmia, myocardial infarction, congestive heart failure and post-PTCA restenosis, cerebrovascular disturbances such as cerebral infarction and cerebral sequelae after subarachnoid hemorrhage, peripheral circulatory disturbances such as arteriosclerosis obliterans, thromboangiitis obliterans and Raynaud disease, and hypertension; their preparation processes; and pharmaceuticals containing them as effec...

Claims

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Application Information

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IPC IPC(8): A61K31/54A61K31/55A61P9/00A61P9/02A61P9/06A61P9/08A61P9/10A61P9/12A61P43/00C07D207/36C07D513/04
CPCC07D513/04C07D207/36A61P43/00A61P9/00A61P9/02A61P9/06A61P9/08A61P9/10A61P9/12
Inventor MIZUNO, AKIRASHIBATA, MAKOTOKAMEI, TOMOEFUKAMI, HARUKAZUINOMATA, NORIO
Owner ASUBIO PHARMA
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