GaCl3-catalyzed [4+2] annulations of allyltrimethylsilane and trimethyl(propargyl)silane with aldimines

The GaCl3-catalyzed reaction of allyltrimethylsilane and aldimines gave tetrahydroquinolines in good yields. Similarly, 4-methylquinoline was obtained by using trimethyl(propargyl)silane via a dehydrogenation process.