Concise approach to benzisothiazol-3(2H)-one via copper-catalyzed tandem reaction of o-bromobenzamide and potassium thiocyanate in water.

A concise approach to various benzisothiazol-3(2H)-one derivatives has been developed by copper-catalyzed the reaction of o-bromobenzamide derivatives with potassium thiocyanate (KSCN) in water. The reaction proceeds via a tandem reaction with S-C bond and S-N bond formation.