An efficient catalytic ylide route to vinyl epoxides
作者:Kai Li、Zheng-Zheng Huang、Yong Tang
DOI:10.1016/s0040-4039(03)00822-0
日期:2003.5
The ylide epoxidation catalyzed by telluronium salts provides a simple and extremely efficient route to vinyl epoxides in excellent yields. Both aromatic and aliphatic aldehydes work well. The best results were obtained by using 2 mol% of telluronium salts with Cs2CO3 in t-BuOH.
碲化物盐催化的叶立德环氧化提供了一种简单且极为有效的途径,以极高的收率生产乙烯基环氧化物。芳族和脂族醛均能很好地发挥作用。通过在叔丁醇中使用2 mol%的碲盐和Cs 2 CO 3获得最佳结果。
Synthesis of Highly Functionalized Allylic Alcohols from Vinyl Oxiranes and <i>N</i>-Tosylhydrazones via a Tsuji–Trost-Like “Palladium–Iodide” Catalyzed Coupling
作者:Stefano Parisotto、Annamaria Deagostino
DOI:10.1021/acs.orglett.8b03026
日期:2018.11.2
An unprecedented efficient palladium(0)-catalyzed reaction of vinyl oxiranes with N-tosylhydrazones, affording “skipped” allylicalcohols in total regioselectivity and stereoselectivity, with excellent functional-group compatibility, is reported. In this Tsuji–Trost-like allylation, we propose the use of N-tosylhydrazones as a synthetic equivalent of α-styryl anions. More than 20 new products are described
Highly Regioselective Rearrangement of 2-Substituted Vinylepoxides Catalyzed by Gallium(III) Triflate
作者:Xian-Ming Deng、Xiu-Li Sun、Yong Tang
DOI:10.1021/jo050810z
日期:2005.8.1
Gallium(III) triflatecatalyzed the rearrangement of 2-substituted vinylepoxides into β,γ-unsaturated carbonyl compounds with high regio- and chemoselectivity (>97/3) in lowcatalystloading (1−5 mol %). The alkyl-substituted trimethylsilylvinyl epoxides gave β,γ-unsaturated ketone, but aryl-substituted vinylepoxides gave the aldehydes instead.
Synthesis of Vinyl Cyclopropanes via Anion Relay Cyclization
作者:Kevin M. Allegre、Nathan Brennan、Jon A. Tunge
DOI:10.1021/acs.orglett.8b01566
日期:2018.7.20
A method where an allylalcohol is formed from a Tsuji–Trost allylation between a vinyl epoxide and an acyl containing nucleophile is described. Subsequently, a retro-Claisen condensation is utilized as a means of through-space anion relay. The anion relay results in the formation of a reactive carbanion and simultaneously activates an allylic alcohol toward intramolecular Tsuji–Trost cyclopropanation