反应详情

A solution of 3-fluoro-4-methoxybenzaldehyde (2.20 g, Ald) in 1,2-diethoxyethane (5 ml) was added with ethyl diethylphosphonoacetate (3.12 ml, TCI) and then added with 60% sodium hydride (624 mg) under ice cooling. The reaction mixture was stirred for 10 minutes, then warmed to room temperature and stirred for 5 hours. The reaction mixture was added with ethyl acetate (90 ml) and washed successively with saturated aqueous sodium hydrogencarbonate, saturated aqueous ammonium chloride and saturated brine. The organic layer was dried, and then the solvent was evaporated under reduced pressure. The residue was purified by flash column chromatography (Quad, hexane:ethyl acetate=10:1) to obtain the title compound (Intermediate 17, 3.16 g).

1. stirringstirred for 5 hours
2. washwashed successively with saturated aqueous sodium hydrogencarbonate, saturated aqueous ammonium chloride and saturated brine
3. customThe organic layer was dried
4. customthe solvent was evaporated under reduced pressure
5. customThe residue was purified by flash column chromatography (Quad, hexane:ethyl acetate=10:1)