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30. Syntheses of benzo-alpha- and benzo-gamma-carbolines via azidoquinolines (Organic azides in heterocyclic synthesis, 5)
Stadlbauer W., Kappe Th., Bull. Slov. Chem. Soc.(Vestn. Slov. Kem. Drus) 33 (1986) 271-281

Abstract: Indolo[2,3-b]quinolines 1 and indolo[3,2-c]quinolines 2, which contain the carboline system, are prepared by ring closure reactions via 2- or 4-azido-3-phenylquinolines 7 or 12., respectively. The angular system was also obtained by cyclodehydrogenation reaction of the 4-amino-3-phenylquinolones 5.

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