Hydrochloric Acid → 5-[(E)-2-(3,5-Dimethoxyphenyl)ethenyl]-2-methoxyphenol

Participants

Reaction Steps

Dissolve compound 21c (5.0 g, 0.015 mol) in anhydrous methanol (50 ml), add in sodium methoxide (1.41 g, 0.024 mol), reflux to react for 3h, after completion of the reaction, pour the reaction solution into ice water, adjust pH to less than 2 with dilute hydrochloric acid, extract three times with ethyl acetate, pool the organic layer, dry the solution over anhydrous magnesium sulfate. Filter, and evaporate the solvent in the solution, redissolve the residue with petroleum ether/ethyl acetate, recrystallize to obtained a white solid (3.70 g, 85%). 1H NMR (400 MHz, DMSO-d6): 3.75 (s, 3H), 3.81 (s, 6H), 6.24 (s, 1H), 6.86 (s, 2H), 6.93 (d, J=16.0 Hz, 1H), 7.01 (d, J=16.0 Hz, 1H), 7.08 (d, J=7.6 Hz, 1H), 7.13 (d, J=7.6 Hz, 1H), 7.15 (s, 1H), 9.89 (s, 1H).

Provenance & Evidence