catalysed decomposition of vinyldiazocarbonyl compounds in the presence of organosilanes led stereospecifically to the corresponding allylsilanes in good yields. An asymmetric approach has also been considered as well as the extension of the methodology to the synthesis of other allylic systems.
Chiral catalyst enhancement of diastereocontrol for OH insertion reactions of styryl- and phenyldiazoacetate esters of pantolactone
作者:Michael P. Doyle、Ming Yan
DOI:10.1016/s0040-4039(02)01282-0
日期:2002.8
The chiral dirhodium(II) catalyst Rh2(MEAZ)4 increases diastereocontrol for intermolecular OH insertion reactions of diazo esters having a chiral auxiliary over that achieved with Rh2(OAc)4.
Preparation of optically active α-silylcarbonyl compounds using asymmetric alkylation of α-silylacetic esters and asymmetric metal-carbene insertion into the SiH bond
作者:Yannick Landais、Denis Planchenault
DOI:10.1016/s0040-4020(97)00002-1
日期:1997.2
Substituted α-silylacetic esters have been prepared in good yields and with reasonable diastereoselectivities by three different routes. The first two involved alkylation of the parent α-silylacetic ester enolates, with the chiral auxiliaries being present either on silicon or on the ester function. The third route involving asymmetric insertion of metal-carbenoids into the SiH bond was found to afford
New reaction of enamines with aryldiazoacetates catalyzed by transition metal complexes
作者:Wei-Jie Zhao、Ming Yan、Dan Huang、Shun-Jun Ji
DOI:10.1016/j.tet.2005.03.093
日期:2005.6
The reaction of aryldiazoacetates with enamines catalyzed by copper and rhodium complexes provided γ-keto esters in good yields. A full investigation of the effects of solvents, catalysts, enamines and aryldiazoacetates on the reaction was carried out. Careful analysis of the crude reaction mixture revealed a substituted enamine as the primary product, which was hydrolyzed over silica gel to give a