A copper-catalyzed one-pot process for the construction of benzo [4,5]imidazo[1,2-a]quinoxalines under air is described. Aryl chlorides, aryl bromides, and aryl iodides can be applied to the synthesis of these compounds.

An Efficient One-Pot Synthesis of Benzo[4,5]imidazo[1,2-a]quinoxalines via Copper-Catalyzed Process. -An efficient domino process for the synthesis of the title compounds from N-tosyl-O-halogenoanilines and 2-chlormethylbenzimidazoles is developed. The process is successfully applied to a halopyridine (VI) as well. -(HUANG, A.; CHEN, Y.; ZHOU, Y.; GUO, W.; WU, X.; MA*, C.; Org. Lett. 15 (2013) 21, 5480-5483, http://dx.