Synthesis of polysubstituted 1,3-cyclohexadienes from ?-branched ?,?-alkenals and monoesters of ylidenemalonic acids
作者:A. G. Nigmatov、I. N. Kornilova、E. P. Serebryakov
DOI:10.1007/bf01433750
日期:1996.1
configurations of which were determined by means of1H NMR spectroscopy. In some cases the formation of cyclic dienes is impeded by the competing process of decarboxylation of acidic ylidenemalonates. The derivatives of 4,6-diphenyl-1,3-cyclohexadienecarboxylic acid were shown to be convenient precursors for the preparation ofmeta-terphenyls.
The effect of pressure on the diastereoselectivity of the reaction of prenal with monoalkyl ylidenemalonates catalysed by homochiral secondary amines
作者:Edward P. Serebryakov、Albert G. Nigmatov、Mikhail A. Shcherbakov
DOI:10.1070/mc2001v011n05abeh001502
日期:2001.1
The effects of the nature of catalyst and of the solvent on the stereoselectivity in amine-catalyzed asymmetric synthesis of substituted cyclohexa-1,3-dienes from prenal and monoesters of ylidenemalonic acids
作者:E. P. Serebryakov、A. G. Nigmatov、M. A. Shcherbakov、M. I. Struchkova
DOI:10.1007/bf02495513
日期:1998.1
In the amine-catalyzed reactions of prenal with (Z)-5-methyl-2-(methoxycarbonyl)hexa-2,4-dienoic or (Z)-3-phenyl-2-(ethoxycarbonyl)prop-2-enoic acid chiral β-amino alcohols provide for higher enantiomeric purity of the resulting alkyl 4-methyl-6-(2-methylprop-1-enyl)-and 4-methyl-6-phenylcyclohexa-1,3-dienoates than that provided by related chiral amines without hydroxy group. The values ofee attained