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Synthesis 1992; 1992(7): 677-680
DOI: 10.1055/s-1992-26198
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Synthesis of 2-Aryl-3-nitro-4H-1-benzopyran-4-ones

Daniel Dauzonne* , Cyrille Grandjean
  • *Service de Chimie de l'Institut Curie, Section de Biologie, URA 1387 du CNRS, 26 rue d'Ulm, F-75231 Paris Cedex 05, France
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Publication Date:
17 September 2002 (online)

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2-Aryl-3-nitro-4H-1-benzopyran-4-ones (or 3-nitroflavones) 3 are conveniently prepared in good yields using a two-step approach starting from 2-aryl-3-chloro-3,4-dihydro-4-hydroxy-3-nitro-2H-1-benzopyrans 1. A general synthesis of the novel 2-aryl-3-chloro-2,3-dihydro-3-nitro-4H-1-benzopyran-4-ones 2 employed as intermediates in the procedure is described.