Reaction of polyhaloalkyl-substituted chromones, pyrones, and furanones with salicylaldehydes as a direct route to fused 2H-chromenes |
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| Authors: | Sosnovskikh Vyacheslav Ya Korotaev Vladislav Yu Chizhov Dmitry L Kutyashev Igor B Yachevskii Danil S Kazheva Olga N Dyachenko Oleg A Charushin Valery N |
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| Institution: | Department of Chemistry, Ural State University, 620083 Ekaterinburg, Russian Federation. vyacheslav.sosnovskikh@usu.ru |
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| Abstract: | Polyhaloalkyl-substituted chromones, gamma-pyrones, and beta-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. |
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