Copper-Catalyzed Synthesis of 2-Unsubstituted, <i>N</i>-Substituted Benzimidazoles

An efficient copper-catalyzed intramolecular arylation of formamidines forming 2-unsubstituted benzimidazoles in excellent yields is reported. Sixteen examples bearing sterically demanding substituents on nitrogen like Mes, 2,6-diisopropylphenyl, or 2-<i>tert</i>-butylphenyl and tolerating various functional groups demonstrate the utility of this method.