R 30 Reaction of 2-(trifluoromethyl)chromones with pyridoxal: Formation of 1-benzopyranooxepino- and 1-benzopyranopyranopyridines / V. Ya. Sosnovskikh, V. Yu. Korotaev, A. Yu. Barkov, A. A. Sokovnina, M. I. Kodess // Journal of Fluorine Chemistry. - 2012. - Vol.141. - С. 58-63 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ALCOHOLIC HYDROXY GROUP -- PHENYL HYDROXY GROUP -- PYRIDOXAL Аннотация: Pyridoxal undergoes oxa-Michael initiated ring closure with 2-(trifluoromethyl)chromones giving 11a,13-dihydro-6H-1-benzopyrano[3′,2′:6,7]oxepino[3,4-c]pyridin-6-ones and 6H,11aH-1-benzopyrano[3′,2′:5,6]pyrano[2,3-c]pyridin-6-ones. Participation of alcoholic hydroxy group of pyridoxal in the initial oxa-Michael addition leads to the former product and that of the phenyl hydroxy group to the later one \\\\Expert2\\nbo\\Journal of Fluorine Chemistry\\2012, v. 141, p.58.pdf |