p-Bromobenzenesulfonyl chloride → N-[4-cyano-3-trifluoromethyl-phenyl]-2-hydroxy-3-[4-bromophenyl-sulfonyloxy]-2-methyl-propionamide

Participants

Reaction Conditions

Reaction Steps

A solution of 5 g (17.35 mmol) of N-[4-cyano-3-trifluoromethyl-phenyl]-2,3-dihydroxy-2-methyl-propionamide in 50 ml of dry pyridine was cooled to 0° C. and 8.86 g (34.70 mmol) of 4-bromo-benzenesulfonyl chloride was added in small portions. The mixture was stirred at 0° C. for 5 h, then diluted with 200 ml of dichloromethane, washed three times with 50 ml of saturated aqueous sodium hydrogencarbonate, twice with 50 ml of 10% aqueous hydrochloric acid and 50 ml of brine. The organic layer was dried over sodium sulfate and concentrated in vacuum. The residue was crystallized from a 1:5 mixture of ethyl acetate/petroleum ether, which has a boiling range of 40–70° C.

Provenance & Evidence