Reaction of 2-(trifluoromethyl)chromones with pyridoxal: Formation of 1-benzopyranooxepino- and 1-benzopyranopyranopyridines
作者:Vyacheslav Ya Sosnovskikh、Vladislav Yu Korotaev、Alexey Yu Barkov、Anna A. Sokovnina、Mikhail I. Kodess
DOI:10.1016/j.jfluchem.2012.06.001
日期:2012.9
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
吡rid醛与2-(三氟甲基)色酮进行oxa-Michael引发的闭环反应,生成11a,13-dihydro-6 H -1-苯并吡喃并[3',2':6,7]氧庚啶[3,4- c ]吡啶6 -ones和6 H,11a H -1-benzopyrano [3',2':5,6] pyrano [2,3- c ] pyridin-6-ones。吡ido醛的醇羟基参与初始的oxa-Michael加成反应生成了前一种产物,而苯基羟基的羟基参与了后者生成的产物。
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.
Sosnovskikh, V. Ya.; Ovsyannikov, I. S., Russian Journal of Organic Chemistry, 1993, vol. 29, # 2.1, p. 214 - 219
作者:Sosnovskikh, V. Ya.、Ovsyannikov, I. S.
DOI:——
日期:——
A simple synthesis of 4-amino-6-methyl-1,1,1-trifluoro(trichloro)hepta-3,5-dien-2-ones and 2,2-dimethyl-6-trifluoromethyl-2,3-dihydro-4-pyridone
作者:V. Ya. Sosnovskikh
DOI:10.1007/bf02495272
日期:1997.12
Treatment of 2,2-dimethyl-6-trifluoro(trichloro)methyl-2,3-dihydro-4-pyrones with ammonia gives 4-amino-1,1,1-trifluoro(trichloro)-6-methylhepta-3, 5-dien-2-ones. Under similar conditions 1,1,1-trifluoro-2-hydroxy-6-methylhepta-2,5-dien-4-one and 6-chloro-1,1,1-trifluoro-2-hydroxy-6-methylhept-2-en-4-one cyclize into 2,2-dimethyl-6-trifluoromethyl-2,3-dihydro-4-pyridone.
Sosnowskikh W. Ja., Owsjannikow I. S., Zh. organ. khimii, 29 (1993) N 2, S 259-264