Facile catalytic methods for intermolecular generation of allylic oxonium ylides and their stereoselective [2,3]- sigmatropic rearrangement
作者:Michael P. Doyle、Vahid Bagheri、Nancy K. Harn
DOI:10.1016/s0040-4039(00)80695-4
日期:1988.1
Allylic oxonium ylides, generated by rhodium(II) acetate-catalyzed decomposition of diazo carbonyl compounds in the presence of allyl methylethers, undergo the [2,3]-sigmatropic rearrangement with a high degree of diastereoselectivity.
Unveiling Latent α-Iminocarbene Reactivity for Intermolecular Cascade Reactions through Alkyne Oxidative Amination
作者:Nina Mace、Aaron R. Thornton、Simon B. Blakey
DOI:10.1002/anie.201301087
日期:2013.5.27
Setting a trap: Described is the development of a metallonitrene‐initiated alkyneoxidationcascade with intermolecular trapping of the reactive intermediate with a variety of allyl ethers to provide α‐oxyimine products in which new CN, CO, and CC bonds have all been generated (see Scheme; tfacam=trifluoroacetamide).
The palladium-catalyzed desilylation-arylation of substituted vinylsilanes by p-iodoanisole in the presence of bidentate phosphine ligands is described. Apart from enhancing the rate of the reaction considerably, heteroatom-based functional groups in the vinylsilane moiety have a profound influence on the regiochemistry. A catalytic cycle for the chelation-controlled desilylation-arylation reaction
(E)- and (Z)-RCH=CHSiMe3(R=Ph, n-C6H13, CH3OCH2) reacted stereospecifically with Ph-Pd-OAc to give RCH=C(Ph)SiMe3 and R(Ph)C=CHSiMe3 with inversion of the starting geometry with respect to R and Me3Si groups.
(E)-和(Z)-RCH = CHSiMe 3(R = Ph,nC 6 H 13,CH 3 OCH 2)与Ph-Pd-OAc立体反应,得到RCH = C(Ph)SiMe 3和R(Ph C = CHSiMe 3,相对于R和Me 3 Si基团,起始几何形状反转。
Stereospecific arylation of alkenylsilanes with arylpalladium acetates