Patent number: 5646164
Abstract: The present inventors have discovered three classes of novel .alpha.-methylene-.gamma.-butyrolactones with excellent antiplatelet activity. As a result of intensive studies, it has been found that compounds represented by the formula I-III are potent inhibitors of platelet aggregation. ##STR1## For the formula I, R.sub.1 is a methyl, a phenyl group optionally substituted with one or two group selected from halide, (C.sub.1 -C.sub.4) alkyl, (C.sub.1 -C.sub.4) alkoxy, phenyl, nitro, amino.For the formula II, R.sub.1 is a methyl, a phenyl group optionally substituted with one or two group selected from halide, (C.sub.1 -C.sub.4) alkyl, (C.sub.1 -C.sub.4) alkoxy, phenyl, nitro, amino; R.sub.2 represents hydrogen, halide, (C.sub.1 -C.sub.4) alkyl, phenyl, nitro, amino; R.sub.3 represents hydrogen, halide, (C.sub.1 -C.sub.4) alkyl, phenyl, nitro, amino.For the formula III, R.sub.1 is a methyl, a phenyl group optionally substituted with one or two group selected from halide, (C.sub.1 -C.sub.4) alkyl, (C.sub.1 -C.
Type:
Grant
Filed:
November 14, 1995
Date of Patent:
July 8, 1997
Assignee:
National Science Council
Inventors:
Cherng-Chyi Tzeng, Yeh-Long Chen, Tai-Chi Wang, Che-Ming Teng