2,2′-Biimidazole as an Efficient Ligand for Copper(I)-Catalyzed C-N Coupling Reactions.

An efficient copper(I)-catalyzed system using 2,2′-biimidazole as the ligand was applied to N-arylation of a broad spectrum of nitrogen nucleophiles with aryl halides. The reactions were carried out in relatively mild conditions with good to excellent yields.