反应详情

温度

45 °C

Into a 3 lit. round-bottomed flask equipped with a thermometer were added aluminum chloride (390.35 gm) and N,N-dimethylaniline (413.10 gm) maintaining the temperature at 40-50° C. To this solution, a solution of (E)-1-(4-(benzyloxy)phenyl)-2-(3,5-bis(benzyloxy)phenyl)ethene (243 gm) prepared according to example 1 in dichloromethane was added and stirred well. After the reaction was over, the reaction mixture was acidified, extracted into ethyl acetate and concentrated to get pure (E)1-(3,5-dihydroxyphenyl)-2-(4-hydroxyphenyl)ethene (E-Resveratrol) in the exclusive E- form in 90% yield. 1H NMR (DMSO-d6, Bruker 400 MHz Avarice): δ 6.11 (t, J=1.8 Hz), 6.38 (d, J=1.8 Hz, 2H), 6.75 (d, J=8.5 Hz, 2H), 6.82 (d, J=16.3 Hz, 1H), 6.92 (d, J=16.3 Hz), 7.39 (d, J=8.4 Hz, 2H); Mass m/e: 228.2.

1. customInto a 3 lit. round-bottomed flask equipped with a thermometer
2. additionwas added
3. extractionextracted into ethyl acetate
4. concentrationconcentrated