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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