Alkylation reactions of benzothiazoles with N,N-dimethylamides catalyzed by the two-component system under visible light

Eosin Y/K2S2O8 catalyzed C2-alkylation reactions of benzothiazoles with N,N-dimethylamides under visible light have been developed. The reactions completed smoothly in the presence of Eosin Y as the photocatalyst and K2S2O8 as the oxidant under solvent-free conditions in open air. This green and simple method provides an alternative route for the synthesis of C2-alkylation of benzothiazoles and tolerates a number of functional groups to afford moderate to excellent yields. (C) 2018 Elsevier Ltd. All rights reserved.