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.

中文翻译：

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双组分体系在可见光下催化苯并噻唑与N，N-二甲基酰胺的烷基化反应

曙红Y / K ₂ S ₂ O ₈在可见光下催化了苯并噻唑与N，N-二甲基酰胺的C2-烷基化反应。在空气中无溶剂的条件下，在曙红Y作为光催化剂和K ₂ S ₂ O ₈作为氧化剂的条件下，反应可以顺利完成。这种绿色且简单的方法为苯并噻唑的C2-烷基化合成提供了另一种途径，并且可以耐受许多官能团，从而提供中等至极好的收率。