Veratraldehyde → 1-(3,4-Dimethoxyphenyl)-2,3-bis(methoxycarbonyl)-4-hydroxy-6,7-methylenedioxynaphthalene
Reaction equation
CO[CH:3]([O:14]C)[C:4]1[CH:9]=[C:8]2[O:10][CH2:11][O:12][C:7]2=[CH:6][C:5]=1Br.[CH3:16][O:17][C:18]1[CH:19]=[C:20]([CH:23]=[CH:24][C:25]=1[O:26][CH3:27])[CH:21]=O.[C:28]([C:34]([O:36][CH3:37])=[O:35])#[C:29][C:30]([O:32][CH3:33])=[O:31]>>[CH3:16][O:17][C:18]1[CH:19]=[C:20]([C:21]2[C:5]3[C:4](=[CH:9][C:8]4[O:10][CH2:11][O:12][C:7]=4[CH:6]=3)[C:3]([OH:14])=[C:29]([C:30]([O:32][CH3:33])=[O:31])[C:28]=2[C:34]([O:36][CH3:37])=[O:35])[CH:23]=[CH:24][C:25]=1[O:26][CH3:27]Participants
4
Procedure
2-Bromo-4,5-methylenedioxybenzaldehyde dimethylacetal, 3,4-dimethoxybenzaldehyde and dimethyl acetylenedicarboxylate are treated in the same manner as described in Example 1, whereby 1-(3,4-dimethoxyphenyl)-2,3-bis(methoxycarbonyl)-4-hydroxy-6,7-methylenedioxynaphthalene is obtained as colorless crystals.