Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1314044 | Journal of Fluorine Chemistry | 2012 | 6 Pages |
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.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlight► 2-(Trifluoromethyl)chromones and pyridoxal hydrochloride were reacted in the presence of sodium hydroxide. ► Two novel polyfluoroalkyl-containing heterocyclic systems, 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 were synthesized. ► The reaction depends on the pH of the aqueous media.