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.