Cyclization of o-phenylenediamines by CO2 in the presence of H2 for the synthesis of benzimidazoles?

Green Chemistry Pub Date: 2012-11-15 DOI: 10.1039/C2GC36517K

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.

Graphical abstract: Cyclization of o-phenylenediamines by CO2 in the presence of H2 for the synthesis of benzimidazoles
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