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29. A simple synthesis of 11H-indolo[3,2-c]quinolin-6-ones (Organic azides in heterocyclic synthesis, 4)
Stadlbauer W., Karem A.S., Kappe Th. Monatsh. Chem. 118 (1987) 81-89

Abstract: 11H-indolo[3,2-c]quinolin-6-ones 2, which are containing the gamma-carboline ring system, can be easiliy synthesized from 4-azido-3-phenyl-2-quinolones 6, which are in turn obtained in a two step reaction from 4-hydroxy-3-phenyl-2-quinolones 3. Cyclization of the azides 6 can be performed by irradiation or thermal reaction.

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