(1)
Liang, Y.; Liu, P.-Z.; Wu, C.-C.; Zhang, Q. Lewis Acid Catalyzed C-N Bond Formation: Synthesis of Quinoxalines via CuX (X = Cl, Br, I) Catalyzed Cyclotrimerization of Alkynes With O-Phenylendiamines. ajc 2015, 27, 3921-3924.