Regioselectivity in the cross condensation of α,β-unsaturated aldehydes and methyl ketones promoted by magnesium phenoxides
作者:Andrea Pochini、Giuseppe Puglia、Rocco Ungaro
DOI:10.1016/s0040-4039(01)95557-1
日期:1979.1
“Kinetic selectivity” in the cross condensation of α,β-unsaturated aldehydes and methyl ketones are obtained using 2,4,6-trimethylphenoxymagnesium bromide (2,4,6-TMPOMgBr) in benzene as catalyst.
Asymmetric addition of arylboroxines to δ-aryl-α,β,γ,δ-unsaturated ketones proceeded in the presence of an iridium catalyst coordinated with a chiral diene ligand to give high yields of δ-diaryl ketones with very high enantioselectivity.
[RuCl<sub>2</sub>(<i>p-</i>cymene)]<sub>2</sub>-Catalyzed Conjugate Addition of Arylboronic Acids to α,β-Unsaturated Ketones under Ligand-Free and Neutral Conditions
作者:Lei Zhang、Xiaomin Xie、Lei Fu、Zhaoguo Zhang
DOI:10.1021/jo4001367
日期:2013.4.5
A simple and efficient Ru-catalyzed conjugate addition reaction of arylboronic acids to α,β-unsaturated ketones under neutral conditions without any additional ligands has been developed. This Ru(II)-catalytic system both fulfilled the inhibition of the β-hydride elimination in the catalytic cycle and minimized the protonolysis of arylboronic acids.
Me<sub>2</sub>(CH<sub>2</sub>CH)SiCN: a bifunctional ethylene equivalent for Diels–Alder reaction based controllable tandem synthesis
作者:Wen-Biao Wu、Bo-Shuai Mu、Jin-Sheng Yu、Jian Zhou
DOI:10.1039/d2sc00147k
日期:——
equivalent for the Diels–Alder (DA) reaction. The use of this reagent enables the controllable synthesis of value-added cyclohexenyl ketones or 2-acyl cyclohexancarbonitrile derivatives through a five- or six-step tandem sequence based on a Wittig/cyanosilylation/DA reaction/retro-cyanosilylation/isomerization sequence that involves a temporary silicon-tethered intramolecular DA reaction.
双功能甲硅烷基试剂 Me 2 (CH 2 CH)SiCN 已被开发为用于 Diels-Alder (DA) 反应的新型乙烯等价物。该试剂的使用能够通过基于 Wittig/氰基硅烷基化/DA 反应/逆氰基硅烷基化/异构化序列的五步或六步串联序列可控合成增值的环己烯基酮或 2-酰基环己腈衍生物,其中包括临时的硅束缚分子内 DA 反应。
Highly Efficient Direct Aerobic Oxidative Esterification of Cinnamyl Alcohol with Alkyl Alcohols Catalysed by Gold Nanoparticles Incarcerated in a Nanoporous Polymer Matrix: A Tool for Investigating the Role of the Polymer Host
cinnamates occurs through two oxidation steps: the selective oxidation of cinnamylalcohol to cinnamaldehyde, followed by oxidation of the hemiacetal that results from the base‐catalysed reaction of cinnamaldehyde with an aliphatic alcohol. The rate constants for the two steps were evaluated in the temperature range 10–45 °C. The cinnamylalcoholoxidation is faster than the oxidative esterification of cinnamaldehyde