A One‐Pot Copper‐Catalyzed 3‐Fold C–N Bond Coupling Strategy to the Synthesis of Substituted Benzimidazoles

An efficient, one‐pot copper catalyzed 3‐fold C–N bond‐coupling strategy leading to pharmaceutically relevant benzimidazole heterocycles is reported. Our strategy involves a copper catalyzed intramolecular C–N coupling of N,N' ‐bis(2‐bromophenyl)formamidine to provide 1‐(2‐bromophenyl)‐1H‐benzimidazole which upon intermolecular coupling with 2‐amino pyridines and a cascade sp 2 C–H amination furnished a range of benzimidazo[1,2‐ a ]benzimidazoles.