Chlorosulfonic acid → 2-Bromo-4-(2,2,2-trifluoroacetamido)benzene-1-sulfonyl chloride

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Reaction Steps

The crude N-(3-bromophenyl)-2,2,2-trifluoroacetamide was cooled to 0° C., then chlorosulfonic acid was added dropwise at 0° C. over 10 min. The r×n mix was stirred at 0° C. to rt overnight. LC/MS monitored the r×n. The r×n mix poured into ice-H2O (100 g) to quench the r×n. The sticky gum was washed with H2O and dried in vacuum to give the crude 2-bromo-4-(2,2,2-trifluoroacetamido)benzene-1-sulfonyl chloride.

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