Visible‐light‐promoted Radical Cyclization/Arylation Cascade for the Construction of α, α‐Difluoro‐γ‐Lactam‐Fused Quinoxalin‐2( 1H )‐Ones

Comprehensive Summary A visible‐light‐induced tandem radical intramolecular cyclization/arylation of quinoxalin‐2(1H)‐ones with bromodifluoroacetamides is described. This protocol allows efficient access to a variety of valuable α,α‐difluoro‐γ‐lactam‐fused quinoxalin‐2(1H)‐ones in moderate to good yields under metal‐free, mild and redox neutral reaction conditions. This strategy is tolerant of various functional groups and a broad range of substrates. The mechanism experiments suggested an involvement of 5‐exo‐trig cyclization and a radical process in this transformation.