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Synthesis 1993; 1993(9): 881-884
DOI: 10.1055/s-1993-25962
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Syntheses of Chromenes and Azachromenes: 2H-1-Benzopyran, 2H-Pyrano[3,2-b]pyridine, 2H-Pyrano[2,3-c]pyridine, and Derivatives

Dominique Billeret* , Dominique Blondeau, Henri Sliwa
  • *Laboratoire de Chimie Organique et Environnement, Université des Sciences et Techniques de Lille, F-59655 Villeneuve d'Ascq Cedex, France
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Publication Date:
29 April 2002 (online)

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2H-1-Benzopyran and derivatives have been prepared by an intramolecular Wittig reaction in a heterogeneous medium starting from salicylaldehyde, (2-hydroxyalkyl)triphenylphosphonium salts, and potassium carbonate. Extension of this reaction to various o-hydroxyformylpyridines were performed in order to obtain 2H-pyrano[3,2-b]pyridine, 2H-pyrano[2, 3-c]pyridine, and derivatives.