An Efficient One-Pot Two Catalyst System in the Construction of 2-Substituted Benzimidazoles: Synthesis of Benzimidazo[1,2-c]quinazolines.

A Ce(III)/Cu(I)-catalytic system mediates the reaction of aryl- and alkylaldehydes (I) and (IV) with o-phenylenediamine (II) to the title compounds in good yields.