Synthesis of Polyaryl‐Substituted Azafluoranthenes via Co‐Catalyzed [2+2+2] Cycloaddition of 1,6‐Diynes with Nitriles

Abstract

AbstractHerein, we demonstrate the synthesis of azafluoranthene derivatives under mild conditions via [2+2+2] cycloaddition of 1,6‐diynes and nitriles catalyzed by CoBr2/dppp, exhibiting good atom economy. This procedure uses an inexpensive ligand and an earth‐abundant metal as catalyst to lower the cost of synthesis. Several azafluoranthenes are produced in 28–95% yields using this approach, featuring mild conditions, wide substrate scope, and good functional group tolerance. The fluorescence spectra of some azafluoranthenes indicate that these scaffolds have good photophysical properties for material science.