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. Key words: acyl azide, cyclization, 1, 2-benzisothiazol-3 (2H)- ...
