A reinvestigation of a possible route to 1,2-Benzisothiazoles: The reaction between N-benzyl-substituted sulphonamides and trichloromethanesulphenyl chloride in the presence of base

Abstract

The reaction between N-benzyl-substituted sulphonamides (1) and trichloromethanesulphenyl chloride in the presence of base afforded the expected N-trichloromethanesulphenyl derivatives (4); the previously reported 1,2-benzisothiazolines (2) were not obtained. Treatment of the derivatives (4) with base under various conditions gave no indication of cyclization to 1,2-benzisothiazolines (2).