A one??pot procedure for the efficient sulfonylation of amines with 4??hydroxybenzenesulfonyl chloride involving in situ protection and deprotection of the phenol with N,O??bis(trimethylsilyl) acetamide (BTSA) is presented. ... A one??pot procedure for the efficient sulfonylation of amines with 4??hydroxybenzenesulfonyl chloride involving in situ protection and deprotection of the phenol with N,O??bis(trimethylsilyl)acetamide (BTSA) is presented. ... View all references we ...