2,1‐Benzisothiazoles. XII. . The use of n‐substituted‐2,1‐ benzisothiazolium salts as synthetic equivalents of o‐aminobenz‐ aldehydes. A simple synthesis of some 2‐Quinolones

Abstract

N‐Substituted‐2,1‐benzisothiazolium salts 2 react with ethyl cyanoacetate in pyridine solution to give substituted 3‐cyano‐2‐quinolones 5.