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。