A heterocyclic oxophthalazinyl acetic acid having aldose reductast inhibitory activity of the formula ##STR1## wherein X is oxygen or sulfur; Z is a covalent bond, O, S, NH or CH.sub.2 or CHR.sub.5 Z is vinyl; R.sub.1 is hydroxy, or a prodrug group; R.sub.2 is a heterocyclic group, R.sub.3 and R.sub.4 are hydrogen or the same or a different substituent, and R.sub.5 is hydrogen, methyl or trifluoromethyl. The pharmaceutically acceptable acid addition salts of the above compounds wherein R.sub.1 is di(C.sub.1 -C.sub.4)alkylamino or (C.sub.1 -C.sub.4)alkoxy substituted by N-morpholino or di(C.sub.1 -C.sub.4)alkylamino and the pharmaceutically active base addition salts of the above compounds wherein R.sub.1 is hydroxy are also aldose reductase inhibitors.
一种具有醛糖还原酶抑制活性的杂环氧
酞嗪基
乙酸,
化学式为##STR1##其中X为氧或
硫;Z为共价键,O,S,NH或CH.sub.2或CHR.sub.5,Z为
乙烯基;R.sub.1为羟基或前药基团;R.sub.2为杂环基,R.sub.3和R.sub.4为氢或相同或不同的取代基,R.sub.5为氢,甲基或三
氟甲基。上述化合物的药学可接受的酸盐,其中R.sub.1为二(C.sub.1-C.sub.4)烷基
氨基或被N-吗啉基取代的(C.sub.1-C.sub.4)烷氧基,以及上述化合物的药学活性碱盐,其中R.sub.1为羟基,也是醛糖还原酶
抑制剂。