The present invention relates to an improved process for the preparation of (4S,6S)-4- (ethylamino)-5,6-dihydro-6-methyl-4H-thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide hydrochloride ("Dorzolamide hydrochloride") having formula 1. Dorzolamide hydrochloride is prepared by the process of the present invention with high chemical and diastereomeric purity. The present invention also relates to novel intermediate of the formula 20 and a process for its preparation. Dorzolamide hydrochloride is useful in the treatment of ocular hypertension by inhibiting carbonic anhydrase enzyme.
本发明涉及一种改进的制备过程,用于制备(4S,6S)-4-(乙基
氨基)-5,6-二氢-6-甲基-4H-
噻吩[2,3-b]
噻吩基喹噁啉-2-磺酰胺-7,7-二
氧化氢盐酸盐(“多索胺盐酸盐”),其
化学和对映体纯度高。本发明还涉及公式20的新型中间体及其制备过程。多索胺盐酸盐通过本发明的方法制备,可用于治疗青光眼,通过抑制
碳酸酐酶酶起作用。