反应详情

17.8 g of N,N'-dicyclohexylcarbodiimide were added while stirring within 5 minutes to a solution of 7.0 g of 4-hydroxybenzaldehyde, 7.4 g of (E)-but-2-enoic acid and 0.1 g of 4-(dimethylamino)pyridine in 50 ml of dichloromethane. The reaction mixture was stirred overnight, then filtered. The filtrate was washed with saturated sodium bicarbonate solution and with water and concentrated. Chomatographic purification of the residue on silica gel with hexane/ethyl acetate (vol. 3:7) and two-fold recrystallization of the fractions which were pure according to thin-layer chromatography gave 12.2 g of 4-[(E)-but-2-enoyloxy]benzaldehyde.

1. filtrationfiltered
2. washThe filtrate was washed with saturated sodium bicarbonate solution and with water
3. concentrationconcentrated
4. customChomatographic purification of the residue on silica gel
5. customwith hexane/ethyl acetate (vol. 3:7) and two-fold recrystallization of the fractions which