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Synthesis 1989; 1989(10): 781-783
DOI: 10.1055/s-1989-27395
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Ring Closure of 4-Azido-3-phenyl-pyridazines to Pyridazino[4,3-b]indoles

W. Stadlbauer* , A. Pfaffenschlager, Th. Kappe
  • *Abteilung for Organische Synthese, Institut für Organische Chemie, Karl- Franzens-Universität Graz, Heinrichstraße 28, A-8011 Graz, Austria
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Publication Date:
02 May 2002 (online)

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The cyclization of 4-azido-3-phenylpyridazines and 7-azido-6-phenyl-tetrazolo [1,5-b]pyridazine by heating with strong acids like methanesulfonic acid affords 5H-pyridazino[4,3-b] indoles or 10H-tetrazolo[1′,5′:1,6]pyridazino[4,3-b] indoles, respectively, whereas the conventional photochemical or thermolytic methods fail.

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