Rapid and Convenient Synthesis of Original 5-Substituted Quinolino[3,4-b]quinoxalin-6(5H)-ones under Eco-Friendly Conditions

We report herein the synthesis of 5-(substituted)quinolino[3,4- b ]quinoxalin-6( 5H )-one derivatives from ethyl 3-(2-bromophenyl)quinoxaline-2-carboxylate under one-pot Buchwald–Hartwig coupling–lactamization reaction.