Rhenium complex-catalyzed coupling reaction of enol acetates with alcohols
作者:Rui Umeda、Yuuki Takahashi、Yutaka Nishiyama
DOI:10.1016/j.tetlet.2014.09.054
日期:2014.10
The reaction of enolacetates with alcohols in the presence of a catalytic amount of a rhenium complex, such as ReBr(CO)5, produced the corresponding ketones and aldehydes in moderate to good yields. It was suggested that the preparation of an ether, an intermolecular dehydrated product, was the first step of the reaction.
When benzylic and allylic alcohols were treated with enolacetate in the presence of a catalytic amount of a rhenium complex, ReBr(CO)5, the carbon-carbon bond formation of the alcohols and enolacetate smoothly proceeded to give the corresponding ketones and aldehyde in moderate to good yields. For the reaction of allylic alcohols, γ,δ-unsaturated carbonylcompounds were obtained in good yields. When
Synthesis of β-aryl ketones by tetraphosphine/palladium catalysed Heck reactions of 2- or 3-substituted allylic alcohols with aryl bromides
作者:Florian Berthiol、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tet.2006.02.061
日期:2006.5
4-tetrakis(diphenylphosphinomethyl)cyclopentane as a catalyst, a range of aryl bromides undergoes Heck reaction using 2- or 3-subtituted allylic alcohols. With these sterically congested alkenes, the selective formation of β-aryl ketones was observed when appropriate reaction conditions were used. The influence of the functional group on the aryl bromide and of the base on the selectivity is remarkable. With several
通过使用[PdCl(C 3 H 5)] 2 /顺式,顺式,顺式,1,2,3,4-四(二苯基膦甲基)环戊烷作为催化剂,一系列芳基溴化物使用2-或2-羟基进行Heck反应。 3位取代的烯丙醇。对于这些空间上拥挤的烯烃,当使用适当的反应条件时,观察到β-芳基酮的选择性形成。官能团对芳基溴化物和碱对选择性的影响是显着的。使用几种底物,使用NaHCO 3代替K 2 CO 3可获得更高的选择性。作为基础。此外,该催化剂可在低负荷下与多种底物一起使用。
Palladium(II)-Catalyzed Conjugate Addition of Aromatics to<i>α</i>,<i>β</i>-Unsaturated Ketones and Aldehydes with Arylantimony Compounds
作者:Chan Sik Cho、Shin-ichi Motofusa、Kouichi Ohe、Sakae Uemura
DOI:10.1246/bcsj.69.2341
日期:1996.8
Triarylstibines react with α,β-unsaturated ketones and aldehydes in acetic acid at room temperature in the presence of AgOAc and a catalytic amount of Pd(OAc)2 to afford the conjugate addition products (the formal hydroarylated compounds to an olefinic part) in good yields. In contrast, diarylantimony chlorides, arylantimony dichlorides, and diphenylantimony acetate react with the enones and enals
Asymmetric Umpolung Hydrogenation and Deuteration of Alkenes Catalyzed by Nickel
作者:Siyu Guo、Xiuhua Wang、Jianrong Steve Zhou
DOI:10.1021/acs.orglett.0c00112
日期:2020.2.7
enantioselectivity, using acetic acid or water as the hydrogen source and indium powder as electron donor. The scope of alkenes herein include α,β-unsaturated esters, nitriles, and ketones as well as allylicalcohols. Asymmetric deuteration of α,β-unsaturated esters is also achieved with deuterated water, the cheapest deuterium source.