The invention concerns novel 1'-substituted spiro[imidazolidine-4,3'-indoline]-2,2',5-triones of the formula: ##STR1## in which R.sup.1 is (1-12C)alkyl; phenyl, naphthylmethyl or cinnamyl optionally bearing 1-2 halogeno substituents; or benzyl optionally bearing 1-3 substituents independently selected from halogeno, trifluoromethyl, (1-4C)-alkyl, (1-4C)alkoxy, nitro, cyano and hydroxy; and ring A optionally bears one substituent selected from halogeno, (1-4C)alkyl, (1-4C)alkoxy, nitro and hydroxy, or two substituents independently selected from halogeno (1-4C)alkyl and nitro; or a pharmaceutically acceptable salt thereof; but excluding those compounds wherein R.sup.1 is methyl, ethyl, n-propyl or unsubstituted benzyl and benzene ring A is unsubstituted. The compounds of the invention are potent inhibitors of the enzyme aldose reductase and are of use in the treatment or prophylaxis of certain complications of diabetes or galactosemia. The invention also embraces processes for the manufacture of the novel compounds of formula I, as well as pharmaceutical compositions of such compounds. A representative compound is 1'-(2-fluoro-4-bromobenzyl)-spiro]imidazolidine-4,3'-indoline]-2,2',5-trio ne.
本发明涉及新型的1'-取代的螺[
咪唑啉-4,3'-
吲哚]-
2,2',5-三
酮,其
化学式为:##
STR1##
其中R.sup.1为(1-12C)烷基;
苯基,
萘基
甲基或肉桂基,可选地带有1-2个卤素取代基;或
苄基,可选地带有1-3个独立选择的取代基,包括卤素,三
氟甲基,(1-4C)-烷基,(1-4C)烷
氧基,硝基,
氰基和羟基;环A可选地带有一个卤素,(1-4C)烷基,(1-4C)烷
氧基,硝基和羟基取代基,或两个独立选择的卤素(1-4C)烷基和硝基取代基;或其药学上可接受的盐;但不包括R.sup.1为
甲基,乙基,正丙基或未取代
苄基,且
苯环A未取代的化合物。本发明的化合物是醛糖还原酶酶的有效
抑制剂,可用于治疗或预防糖尿病或半
乳糖血症的某些并发症。本发明还涵盖了制造式I的新型化合物的方法,以及这些化合物的制药组合物。代表性化合物是1'-(2-
氟-4-
溴苄基)-螺[
咪唑啉-4,3'-
吲哚]-
2,2',5-三
酮。