SYNTHESIS OF 5,8-DIHYDROXY-3,4-DIHYDROCARBOSTYRIL

5, 8-Dihydroxy-3, 4-dihydrocarbostyril, a key intermediate for the synthesis of β1-selective 8-acetonyloxy-5-[3-(3, 4-dimethoxyphenethylamino)-2-hydroxypropoxy]-3, 4-dihydrocarbostyril hydrochloride (opc-1427) was prepared from 2, 5-dimethoxyaniline.