Transition Metal-Free Iodosobenzene-Promoted Direct Oxidative 3-Arylation of Quinoxalin-2(H)-ones with Arylhydrazines

A transition metal-free iodosobenzene-promoted direct oxidative 3-arylation of quinoxalin-2(H)-ones was developed using various arylhydrazines under air. The protocol affords a variety of 3-arylquinoxalin-2(H)-one derivatives in moderate to good yields. This method provides a rapid access to biologically interesting benzo[g]quinoxalinones and pyrido[3,4-b]pyrazinones. The present methodology features high functional group tolerance including base-sensitive groups as well as allyl- and benzyl-substituted quinoxalin-2(H)-ones under mild reaction conditions.