Palladium-catalyzed reaction between aryl or alkenyl halides and (1-carbalkoxy-1-alkenyl)zinc iodides. A new class of unmasked β-substituted acrylate α-anion equivalents
β-substituted acrylate α-anion equivalents have been directly and very efficiently prepared by insertion of zinc metal into the carbon-iodine bonds of alkyl (E)- or (Z)-2-iodo-2-alkenoates, (E)-or (Z)-(4), respectively. The stereoisomeric composition of these new reagents, 12, depends on the experimental conditions used for their preparation. Their Pd0-catalyzed reaction with alkenyl or aryl halides
Mixtures of chiral monophosphorus compounds used as ligand systems for asymmetric transition metal catalysis
申请人:Reetz T. Manfred
公开号:US20060014981A1
公开(公告)日:2006-01-19
The invention relates to certain chiral transition metal catalysts, to the metal of which at least two structurally different monophosphorus ligands are bonded, at least one of said monophosphorus ligands being chiral. Said chiral transition metal catalysts are suitable as catalysts for use in asymmetric transition metal-catalyzed reactions, providing better enantioselectivities than in cases where only one structurally defined ligand is used.
New and efficient procedures for the synthesis of stereodefined 2-(hetero)aryl and 2-methyl substituted alkyl 2-alkenoates having very high stereoisomeric purity
作者:Renzo Rossi、Adriano Carpita、Paolo Cossi
DOI:10.1016/s0040-4039(00)60119-3
日期:1992.7
Stereodefined 2-(hetero)aryl and 2-methyl substituted alkyl 2-alkenoates of general formula 1 and 2 have been synthesized with a high degree of stereoselectivity as well as in good overall yields starting from alkyl 2-alkynoates, 4.
ROUSSEAU, G.;SLOUGUI, N., TETRAHEDRON, 1985, 41, N 13, 2653-2664