Pd-catalysed reaction of allylic acetates with carbonyl compounds via electrochemical reduction
作者:Weiming Qiu、Zhiqin Wang
DOI:10.1039/c39890000356
日期:——
Electroreductive addition of allylicacetates to carbonylcompounds proceeded smoothly at room temperature using zinc chloride and a catalytic amount of PdCl2(PPh3)2 to give the corresponding homoallylic alcohols.
Catalyzed by PdCl2, SnCl2 can efficiently mediate the allylation of various aldehydes with allyl chloride or bromide, but not with allyl alcohol, in fully aqueous media. The yield of the reaction is very high (90–100%), and the reaction is operationally simple, environmental benign and easy to scale up.
Oxime Radical Promoted Dioxygenation, Oxyamination, and Diamination of Alkenes: Synthesis of Isoxazolines and Cyclic Nitrones
作者:Bing Han、Xiu-Long Yang、Ran Fang、Wei Yu、Chao Wang、Xiao-Yong Duan、Shuai Liu
DOI:10.1002/anie.201203799
日期:2012.8.27
Up the tempo: The intramolecular addition of oxime radicals to CC bonds was achieved by using DEAD and TEMPO to give 4,5‐dihydroisoxazoles as a result of a CO bond‐forming, 5‐exo‐trig cyclization. γ,δ‐Unsaturated ketoximes also reacted to afford cyclicnitrones through CN bond formation. The reactions offer a metal‐free approach for the vicinal difunctionalization of unactivated alkenes.
The diastereoselectivesynthesis of anti-homoallylic alcohols bearing conjugated (Z)-enynes through a palladium-catalyzed three-component reaction is described. This reaction features a broad substrate scope, good functional group compatibility, and high levels of (Z)-alkene stereocontrol. In this reaction, Pd(0) functions as a catalyst in two fundamental steps of the tandem sequence: 1) the generation
描述了通过钯催化的三组分反应非对映选择性合成带有共轭 ( Z )-烯炔的抗高烯丙醇。该反应具有底物范围广、官能团相容性好、( Z )-烯烃立体控制水平高的特点。在该反应中,Pd(0) 在串联序列的两个基本步骤中充当催化剂:1) 从双功能连接试剂生成硼化 π-烯丙基钯物种,诱导醛的 umpolung 烯丙基化,以及 2) C( sp 2 )−C( sp ) 交叉耦合。所得产物的进一步转化突出了它们的合成效用。
Utilization of Me<sub>3</sub>SiSnBu<sub>3</sub>-F<sup>−</sup>in Organic Synthesis. Reaction of an Allyl Anion Generated from Me<sub>3</sub>SiSnBu<sub>3</sub>and CsF
作者:Atsushi Kinoshita、Miwako Mori
DOI:10.1246/cl.1994.1475
日期:1994.8
The intramolecular cyclization of an allyl halide having a carbonyl group proceeded smoothly via an allyl anion in the presence of Me3SiSnBu3 and CsF in DMF. The resultant products were converted into useful compounds for the synthesis of natural products.