Benzopyran- and benzothiopyran-4 -carboxylic acid aldose reductase inhibitors of the formula:
or a pharmaceutically acceptable salt thereof, wherein X is 0, S,S=0 or
n is zero or one; R is hydrogen or alkyl of 1 to 4 carbon atoms; R1 is hydrogen, chloro, bromo, fluoro or phenyl; R2 and R3 when taken individually, are each hydrogen, alkyl of 1 to 3 carbon atoms, chloro, bromo or fluoro; and when taken together, R2' R3 and the carbon atoms to which they are connected form a fused benzene ring; with the proviso that at least one of R1, R2 and R3 is chloro, bromo or fluoro. The compounds are useful in the treatment of diabetic- associated complications, such as cataracts, neuropathy or retinopathy, in a diabetic host. Also disclosed are methods for preparing the compounds of the formula (I) and their salts, and pharmaceutical compositions containing them.
式中的苯并
吡喃和苯并
噻喃-4-
羧酸醛糖还原酶
抑制剂:
或其药学上可接受的盐,其中 X 是 0、S、S=0 或
n 为 0 或 1;R 为氢或 1 至 4 个碳原子的烷基;R1 为氢、
氯、
溴、
氟或苯基;R2 和 R3 单独使用时,各自为氢、1 至 3 个碳原子的烷基、
氯、
溴或
氟;R2' R3 和它们连接的碳原子一起使用时,形成融合苯环;但 R1、R2 和 R3 中至少有一个为
氯、
溴或
氟。这些化合物可用于治疗糖尿病宿主的糖尿病相关并发症,如白内障、神经病变或视网膜病变。还公开了制备式(I)化合物及其盐类的方法,以及含有这些化合物的药物组合物。