R 30 Reaction of Polyhaloalkyl-Substituted Chromones, Pyrones, and Furanones with Salicylaldehydes as a Direct Route to Fused 2H-Chromenes [Electronic resource] / V. Ya. Sosnovskikh, V. Yu. Korotaev, D. L. Chizhov, I. B. Kutyashev, D. S. Yachevskii, O. N. Kazheva, O. A. Dyachenko, V. N. Charushin // Journal of Organic Chemistry. - 2006. - Vol. 71, № 12. - P4538-4543 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: Polyhaloalkyl-substituted chromones, Y-pyrones, and B-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. ?? \\\\Expert2\\nbo\\Journal of Organic Chemistry\\2006, v.71, N 12, p.4538.pdf |