Palladium‐Catalyzed Domino Reaction for the Synthesis of 3‐Amino 1,2,4‐Benzothiadiazine 1,1‐Dioxides

Abstract

A palladium‐catalyzed domino reaction of 2 azidosulfonamides and isocyanides enables the synthesis of 3‐amino‐substituted 1,2,4‐benzothiadiazine 1,1‐dioxides at room temperature. By applying commercially available Pd(dba)2 in catalyst loadings as low as 1.0 mol%, a variety of 21 differently substituted 2<i>H</i>‐1,2,4‐benzothiadiazine 1,1‐dioxides can be prepared within 2 h. Moreover, the developed protocol gives access to the related 4<i>H</i> heterocycles.