Indolopyridines with a hetero atom at a position of fusion. 5. Catalytic synthesis of indolo[2,1-a]isoquinoline by pyrolysis of benzylisoquinolines

High-temperature heterocyclization of α-benzylisoquinolines on oxide-type catalysts gave angular indolo[2,1a] isoquinoline. © 1994 Plenum Publishing Corporation.