Triphenylphosphine → 3-(Bromomethyl)-5-chlorobenzamide

Participants

Reaction Steps

(Step 2) Triphenylphosphine (1.27 g) was suspended in acetonitrile (50 ml), bromine (0.25 ml) was added, and the suspension was stirred for 30 min. 3-Chloro-5-(hydroxymethyl)benzamide (0.90 g) obtained in Step 1 was added to the reaction mixture, and the mixture was stirred at 85° C. for 2 hr. The reaction solution was quenched with water and extracted with ethyl acetate. The extract was washed with aqueous sodium hydrogen carbonate solution and then with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was treated by silica gel chromatography (ethyl acetate:hexane=1:1) to give 3-(bromomethyl)-5-chlorobenzamide (0.54 g).

Provenance & Evidence