Tetrahydropyrrolo[1,2-a]pyrazine-4-spiro-3'-pyrrolidine derivatives of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen, halogen, trifluoromethyl, alkyl having 1 to 6 carbon atoms, alkoxy having 1 to 6 carbon atoms, or nitro, and R.sup.3 is hydrogen, halogen or alkyl having 1 to 6 carbon atoms, and pharmaceutically acceptable salts thereof, processes for preparation thereof, and pharmaceutical composition containing the same. Said compounds and their salts show excellent aldose reductase inhibitory activity and are useful for the prevention and treatment of diabetic complications.
Tetrahydropyrrolo[1,2-a]pyrazine-4-spiro-3'-pyrrolidine衍
生物的
化学式为:##STR1##其中R.sup.1和R.sup.2独立地为氢、卤素、三
氟甲基、具有1至6个碳原子的烷基、具有1至6个碳原子的烷氧基或硝基,R.sup.3为氢、卤素或具有1至6个碳原子的烷基,以及其药学上可接受的盐,制备方法和含有这些化合物的药物组合物。这些化合物及其盐显示出优秀的醛糖还原酶抑制活性,可用于预防和治疗糖尿病并发症。