A new cascade based on a novel allylic diindium reagent has been developed; the indium reagent prepared from 3-bromo-1-iodopropene successively coupled with carbonyl compounds and then with aryl, alkenyl or allyl halides in the presence of a Pd(0) catalyst to afford a convenient one-pot synthesis of linear homoallylic alcohols.
Distal Alkenyl C–H Functionalization via the Palladium/Norbornene Cooperative Catalysis
作者:Zhao Wu、Nina Fatuzzo、Guangbin Dong
DOI:10.1021/jacs.9b11479
日期:2020.2.12
A distal-selective alkenyl C-H arylation method is reported through a directedpalladium/norbornene (Pd/NBE) cooperative catalysis. The key is to use an appropriate combination of the directing group and the NBE co-catalyst. A range of acyclic and cyclic cis-olefins are suitable substrates, and the reaction is operated under air with excellent site-selectivity. Preliminary mechanistic studies are consistent
报道了一种通过定向钯/降冰片烯(Pd/NBE)协同催化的远端选择性烯基CH芳基化方法。关键是使用导向基团和NBE助催化剂的适当组合。一系列无环和环状顺式烯烃都是合适的底物,反应在空气下进行,具有优异的位点选择性。初步机制研究与所提出的 Pd/NBE 催化 CH 激活而不是 Heck 途径一致。使用 MeI 和溴乙酸甲酯作为亲电子试剂,在远端烷基化方面也取得了初步成功。
Allylation of Carbonyl Compounds Mediated by Aluminum/Fluoride Salts in Water
作者:Shizhen Yuan、Jin Liu、Ling Xu、Shaofeng Zhu
DOI:10.1002/cjoc.201090115
日期:——
A novel mediator (Al/KF) has been developed and employed in the Barbier‐type alkylations of various aldehydes and ketones with alkyl halide in water. The carbonyl compounds could be effectively converted into corresponding homoallylic alcohol in good yields only when allylbromides or substituted allylbromides were used as halides. Aromatic aldehydes could afford homoallylic alcohols in high yields
Bismuth mediated barbier synthesis of <i>α</i>-homoallylic alcohols via a sigmatropic rearrangement in [bmim][HSO<sub>4</sub>]
作者:Sucheta Chatterjee、Papiya Dey、Seema V. Kanojia、Subrata Chattopadhyay、Dibakar Goswami
DOI:10.1080/00397911.2020.1854785
日期:2021.3.4
A novel protocol for the Bismuth metal mediated regioselctive crotylation of aldehydes yielding α-homoallylic alcohols has been developed using 20 mol% [bmim][HSO4] as a metal activator, as well as...
On the Transmetallation of (<i>E</i>)-1-Phenyl-3-(tributylstannyl)propene and 3-Phenyl-3-(tributylstannyl)propene with BuSnCl<sub>3</sub>
作者:Hideyoshi Miyake、Kimiaki Yamamura
DOI:10.1246/cl.1993.1473
日期:1993.9
Transmetallation of (E)-1-phenyl-3-(tributylstannyl)propene and 3-phenyl-3-(tributylstannyl)propene with BuSnCl3, and the isomerization of the transmetallated product are described. The application of the reactions to stereoselective (Z)-3-phenyl-2-propenylation and threo-1-phenyl-2-propenylation of aldehydes is also described.