Compounds having the formula:
wherein R1a is hydroxy, halogen, nitro, amino, cycloalkyl having from 3 to 8 carbon atoms, aryl or aryloxy which may be substituted with halogen,
R2 is hydrogen, halogen or lower alkyl,
R' is carboxy or protected carboxy,
Ya is sulfur, oxygen or methylene, and
A is lower alkylene,
provided that when R2 is hydrogen and Ya is sulfur or oxygen, is not halogen; and pharmaceutically acceptable salts thereof are useful in the treatment of diabetic complications.
The compounds of the invention can be prepared by a number of chemical techniques.
具有以下式子的化合物:其中R1a是羟基、卤素、硝基、
氨基、具有3至8个碳原子的环烷基、芳基或可被卤素取代的芳氧基,R2是氢、卤素或低级烷基,R'是羧基或保护羧基,Ya是
硫、氧或亚甲基,A是低级亚烷基,但当R2是氢,Ya是
硫或氧时,不是卤素;其药学上可接受的盐类可用于治疗糖尿病并发症。 本发明的化合物可通过多种
化学技术制备。