Abstract
1,2-Benzisothiazol-3(2H)-one was synthesized by treatment of 2-mercaptobenzoic acid with diphenyl phosphoryl azide, followed by cyclization of the resulting acyl azide at low temperature, where Curtius rearrangement did not occur. 5-Amino-1,2-benzisothiazol-3(2H)-one was similarly synthesized in one pot from 4-mercaptoisophthalic acid
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