Palladium-Catalyzed Electro-oxidative C–H Amination toward the Synthesis of Pyrido[1,2-<i>a</i>]benzimidazoles with Hydrogen Evolution
Zhengli DuanThe Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, People’s Republic of ChinaLin ZhangNational Research Center for Carbohydrate Synthesis Jiangxi Normal University, Nanchang, Jiangxi 330022, People’s Republic of ChinaWenxin ZhangThe Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, People’s Republic of ChinaLijun LuThe Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, People’s Republic of ChinaLi ZengThe Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, People’s Republic of ChinaRenyi ShiThe Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, People’s Republic of ChinaAiwen LeiNational Research Center for Carbohydrate Synthesis Jiangxi Normal University, Nanchang, Jiangxi 330022, People’s Republic of China
2020en
ABI
Аннотация
Transition-metal-catalyzed oxidative C–H/N–H coupling reaction is an important method to construct C–N bonds. However, stoichiometric oxidants were usually necessary. Here, we report a palladium-catalyzed electro-oxidative intramolecular C–H/N-H annulation reaction without an external oxidant or additive. A variety of pyrido[1,2-a]benzimidazoles were constructed by a simple, green, and mild path. Experimental results suggested that Pd(0) could be oxidized on the anode to be recycled.
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