Photoredox RadicalCyclization of <i>o</i>‑Vinylaryl Isocyanides andAryldiazonium Tetrafluoroboratesfor 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 <i>o</i>-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.