Photoredox Radical Cyclization of o-Vinylaryl Isocyanides and Aryldiazonium Tetrafluoroborates for the Synthesis of 2,4-Disubstituted Quinolines

Quinolines, a significant part of nitrogen-containing heterocycles, are widely found in functional compounds. Herin, a photochemical radical cyclization reaction of o-vinylaryl isocyanides and aryldiazonium tetrafluoroborates, has been reported to build 2,4-diaryl quinolines. Readily accessible aryl diazonium salts were utilized as aryl radical precursors at room temperature. This approach allowed good functional group tolerance and substrate applicability.