Cyclization of o-phenylenediamines by CO₂in the presence of H₂for the synthesis of benzimidazoles

Abstract

The cyclization of o-phenylenediamines by CO2 in the presence of H2 was presented to directly synthesize benzimidazoles, and a series of benzimidazoles were obtained in excellent yields using RuCl2(dppe)2 as the catalyst.