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Palladium-Catalyzed Electro-oxidative C–H Amination toward the Synthesis of Pyrido[1,2‑a]benzimidazoles with Hydrogen Evolution
journal contribution
posted on 2020-03-10, 11:44 authored by Zhengli Duan, Lin Zhang, Wenxin Zhang, Lijun Lu, Li Zeng, Renyi Shi, Aiwen LeiTransition-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.