Photoinduced tandem radical cyclization/heteroarylation of N-allylbromodifluoroacetamides with quinoxalin-2(1H)-ones or coumarins under metal- and photocatalyst-free conditions

A photocatalyst-free visible-light-promoted tandem intramolecular cyclization/heteroarylation between bromodifluoroacetamides and quinoxalin-2(1 H )-ones or coumarins was developed. The process could generate a broad range of α , α -difluoro-γ-lactams.