The Meyer-Schuster Rearrangement of Ethoxyalkynyl Carbinols
作者:Gregory Dudley、Susana Lopez、Douglas Engel
DOI:10.1055/s-2007-973885
日期:2007.4
combination of electron-rich alkoxyacetylenes and cationic gold catalysts provides excellent reactivity for the Meyer-Schusterrearrangement under mild conditions. Optimization of the reaction conditions with respect to stereoselectivity and investigations into the scope and mechanism of the rearrangement of secondary ethoxyalkynyl carbinols (y-ethoxy-substituted propargyl alcohols) to α,β-unsaturated esters
Lewis acid-catalyzed Meyer–Schuster reactions: methodology for the olefination of aldehydes and ketones
作者:Douglas A. Engel、Susana S. Lopez、Gregory B. Dudley
DOI:10.1016/j.tet.2008.02.030
日期:2008.7
In principle, the most efficient and atom-economical means of converting an aldehyde or ketone into the homologated α,β-unsaturatedester is through addition/rearrangement sequences involving acetylenic π-bonds (Scheme 1). Implementation of such a strategy for the synthesis of α,β-unsaturatedesters is presented: addition of ethoxyacetylene followed by scandium(III) triflate-catalyzed Meyer–Schuster
Contemporaneous Dual Catalysis: Chemoselective Cross-Coupling of Catalytic Vanadium–Allenoate and π-Allylpalladium Intermediates
作者:Barry M. Trost、Xinjun Luan、Yan Miller
DOI:10.1021/ja204817y
日期:2011.8.17
This paper presents a detailed investigation of a dual catalytic system that combines a vanadium-catalyzed Meyer-Schuster rearrangement and a palladium-catalyzedallylicalkylation. The implementation of this novel reaction relies on matching the formation rates of vanadium-allenoate and π-allylpalladium intermediates with their bimolecular coupling rate in order to minimize the undesired protonation
Redox-Neutral Arylations of Vinyl Cation Intermediates
作者:Daniel Kaiser、Luis F. Veiros、Nuno Maulide
DOI:10.1002/adsc.201600860
日期:2017.1.4
present a new unified concept for C−C bond formation under redox‐neutral conditions. Our strategy hinges upon interception of a vinyl cation with a sulfoxide resulting in simultaneous C–C and C−O bond formation and arylation. A range of structurally diverse vinyl cations are generated in situ in the presence of a sulfoxide, resulting in hydrative arylation, direct arylation of enol triflates and interrupted
[(NHC)AuCl]-catalyzed Meyer–Schuster rearrangement: scope and limitations
作者:Rubén S. Ramón、Nicolas Marion、Steven P. Nolan
DOI:10.1016/j.tet.2008.10.111
日期:2009.2
system allowing for the synthesis of a variety of α,β-unsaturated ketones has been developed. [(NHC)AuCl] (NHCN-heterocyclic carbene) in the presence of a silver(I) salt was found to catalyze the Meyer–Schuster rearrangement, leading to α,β-unsaturated ketones from easily accessible propargylic alcohols in high yields. Catalysis was performed in a 2:1 mixture of methanol and water at 60 °C and afforded