反应详情

2-Bromo-3,4,5-trimethoxybenzaldehyde dimethyl-acetal, 3-methoxy-4-ethoxybenzaldehyde and dimethyl acetylenedicarboxylate are treated in the same manner as described in Example , whereby 1-(3-methoxy-4-ethoxyphenyl)-2,3-bis(methoxycarbonyl)-4-hydroxy-6,7,8-trimethoxynaphthalene is obtained as colorless needles.