WEPA: a reusable waste biomass-derived catalyst for external oxidant/metal-free quinoxaline synthesisviatandem condensation–cyclization–oxidation of α-hydroxy ketones

WEPA, a waste biomass-derived catalyst, was used to synthesize quinoxalines from aryl/heteroaryl 1,2-diamines and α-hydroxy ketones via metal catalyst/added oxidant-free sequential condensation–cyclization–oxidation process.