Reaction of Polyhaloalkyl-Substituted Chromones, Pyrones, and Furanones with Salicylaldehydes as a Direct Route to Fused 2<i>H</i>-Chromenes
作者:Vyacheslav Ya. Sosnovskikh、Vladislav Yu. Korotaev、Dmitry L. Chizhov、Igor B. Kutyashev、Danil S. Yachevskii、Olga N. Kazheva、Oleg A. Dyachenko、Valery N. Charushin
DOI:10.1021/jo060459x
日期:2006.6.1
Polyhaloalkyl-substituted chromones, γ-pyrones, and β-furanones react with salicylaldehydes in the presence of piperidine to give a wide variety of fused 2H-chromenes in good yields. This novel annulation reaction presumably proceeds by a tandem intermolecular oxa-Michael addition and subsequent intramolecular Mannich condensation.