A general procedure for the synthesis of quinolines via the Friedlander annulation using 2,4,6-trichloro-1,3,5-triazine (TCT) (4 mol %) as a novel catalyst is described. The method is simple, efficient, and rapid to afford quinolines in high yields.
Silica supported phosphomolybdic acid, an eco-friendly heterogeneouscatalyst, has been found to be highly efficient for Friedlander synthesis of quinolines in excellent yields. A variety of ketones afford the quinolines smoothly. The catalyst can be easily recovered and reused.