A metal-catalyst-free synthesis of substituted quinoxalin-2-ones from 2,2-dibromo-1-arylethanone by employing an oxidative amidation–heterocycloannulation protocol is reported. The substrate scope of the reaction has been demonstrated and a possible mechanism for this reaction has also been proposed.
Key words
oxidative amidation - heterocycloannulation - quinoxalin-2(1
H)-one - 2,2-dibromo-1-arylethanone