Unique benzothiazole derivatives which exert superior aldose redactase inhibiting actions are unexpectedly and advantageously useful in the prophylactic and therapeutic treatment of diabetic complications. A benzothiazole derivative compound of the formula (1):
wherein X is halogen, R¹ and R², which are the same or different, are each independently hydrogen or halogen, A is a methylene group or a sulfur atom, and
-B-COOR³ is a group selected from the group consisting of (2) to (5):
wherein R³ is hydrogen or C1 to C3 lower alkyl, Y is hydrogen, halogen, C1 to C3 lower alkyl, carboxyl or dilower alkylamino and n is an integer of 1 to 3; Z is oxygen or sulfur, R⁴ is C1 to C3 lower alkyl, optionally substituted phenyl, optionally substituted benzyl or optionally substituted phenethyl and m is an integer of 2 to 5; or a pharmaceutically acceptable salt and a pharmaceutical composition comprising the same which is a useful prophylactic or therapeutic agent for the treatment of diabetic complications.
独特的
苯并噻唑衍
生物具有优异的醛糖还原酶抑制作用,在预防和治疗糖尿病并发症方面具有意想不到的优势。一种式(1)的
苯并噻唑衍
生物化合物:
其中 X 是卤素,R¹ 和 R²(相同或不同)各自独立地为氢或卤素,A 是亚甲基或
硫原子,以及
-B-COOR³ 是选自 (2) 至 (5) 所组成的基团:
其中 R³ 是氢或 C1 至 C3 低级烷基,Y 是氢、卤素、C1 至 C3 低级烷基、羧基或稀释烷基
氨基,n 是 1 至 3 的整数;Z 是氧或
硫,R⁴ 是 C1 至 C3 低级烷基、任选取代的苯基、任选取代的苄基或任选取代的苯乙基,m 是 2 至 5 的整数;或一种药学上可接受的盐和由其组成的药物组合物,该药物组合物是治疗糖尿病并发症的有效预防或治疗剂。