反应详情

A solution of methyl 2-(4-fluorophenyl)-4-(3-hydroxyprop-1-en-1-yl)benzoate (17 g), triphenylphosphine (22.8 g; 87 mmol) and tetrabromomethane (28.8 g; 87 mmol) in dichloromethane (200 ml) was stirred at 0° C. for 1 hour. After filtration of the insoluble material and evaporation to dryness, the residue was purified by flash chromatography eluting with dichloromethanelpetroleum ether (30/70) to give methyl 2-(4-fluorophenyl)-4-(3-bromoprop-1-en-1-yl)benzoate as a mixture of E and Z isomers.

1. filtrationAfter filtration of the insoluble material and evaporation to dryness
2. customthe residue was purified by flash chromatography
3. washeluting with dichloromethanelpetroleum ether (30/70)