The rhodium-catalysed synthesis of pyrrolidinone-substituted (trialkylsilyloxy)acrylic esters
作者:Daniel L. Priebbenow、Carsten Bolm
DOI:10.1039/c3ra41527a
日期:——
A method for the preparation of novel pyrrolidinesubstituted (trialkylsilyloxy)acrylic esters has been developed. The protocol involves a rhodium-catalysed O-insertion/rearrangement reaction between N-functionalised 2-pyrrolidinones and α-silyl α-diazoacetates to form the corresponding acrylic esters in moderate to high yields.
The Cyclopropylmethylsilane Terminated Prins Reaction: Stereoelectronic Controlled Formation of (<i>E</i>)-Skipped Dienes Alcohols and a (<i>Z</i>)-Skipped Diene Modification
作者:D. Christopher Braddock、D. Michael Badine、Thomas Gottschalk、Ai Matsuno、Margarita Rodriguez-Lens
DOI:10.1055/s-2003-37111
日期:——
The reaction of l-phenyldimethylsilyl-2-vinyl cyclopropane with aldehydes under the influence of dimethylaluminium chloride proceeds smoothly to provide skipped diene alcohols with exclusive E-olefin geometry regardless of the initial cis/trans configuration of the starting cyclopropane. The reaction is under stereoelectronic control where the Prins cation favours an anti-bisected conformation. A syn-bisected
Exclusive Aromatic vs Aliphatic C–H Bond Functionalization by Carbene Insertion with Gold-Based Catalysts
作者:Ivan Rivilla、B. Pilar Gómez-Emeterio、Manuel R. Fructos、M. Mar Díaz-Requejo、Pedro J. Pérez
DOI:10.1021/om200206m
日期:2011.5.23
The direct functionalization of aromatic C–H bonds by carbeneinsertion from diazo compounds catalyzed by gold complexes with N-heterocyclic ligands is described. The reaction is completely selective toward the Csp2–H bonds, other Csp3–H bonds remaining unreacted. A study with several NHC ligands in Au(I) and Au(III) complexes has been performed. The potential application of this strategy to give profen
The formation of novel trimethylsilyl-substituted allenes, including silyl ketene acetals incorporating an allenic moiety, by lithiation/silylation of ethyl 2-alkyl-1-trimethylsilylcycloprop-2-ene-1-carboxylate, is described. The reaction involves formation of silyl ketene acetal 3
(3a) which upon aqueous work-up gives diastereomeric allenes 4′
(4′a) and 4″
(4″a). Becke3LYP/6-311+G** calculations were also carried out to provide geometries, energies and insights into the electronic structure of the proposed reaction intermediates.