Visible-light-promoted radical amidoarylation of arylacrylamides towards amidated oxindoles

A visible-light-promoted intermolecular radical amidation/cyclization of arylacrylamides was realized by using N-aminopyridinium salts as the source of amidyl radicals. The reaction exhibits a broad scope and good functional group tolerance, and a variety of amide-tethered-oxindoles were prepared in this way in moderate to good yields.