反应详情

(Step 3) Triphenylphosphine (0.94 g) was suspended in acetonitrile (20 ml), bromine (0.19 ml) was added, and the mixture was stirred for 30 min. A solution (10 ml) of 3-chloro-5-(hydroxymethyl)benzonitrile (0.60 g) obtained in Step 2 in acetonitrile was added to the reaction mixture, and the mixture was stirred at 80° C. for 4 hr. The reaction solution was quenched with water, and the mixture was 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 basic silica gel chromatography (ethyl acetate:hexane=1:2) to give 3-(bromomethyl)-5-chlorobenzonitrile (0.31 g) as a white solid.

1. stirringthe mixture was stirred at 80° C. for 4 hr
2. customThe reaction solution was quenched with water
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with aqueous sodium hydrogen carbonate solution
5. dry with materialwith saturated brine, and dried over anhydrous magnesium sulfate
6. customThe solvent was evaporated under reduced pressure
7. additionthe obtained residue was treated by basic silica gel chromatography (ethyl acetate:hexane=1:2)