Regioselective intramolecular sp2 C–H amination: direct vs. mediated electrooxidation

Abstract

We reported an electrochemical intramolecular C–H amination approach to construct benzimidazole-fused phenanthridines. This electrochemical approach was compatible with a variety of functional groups, including ester, silyl, thioether, pyridyl and amine groups. With the triarylamine-mediated and direct oxidation strategies, the intramolecular C–H amination proceeds with high regioselectivities under oxidant- and metal-free conditions. Moreover, this protocol provided an alternative approach to access organic luminophores.