Gold-Catalyzed Hydrophenoxylation of Propargylic Alcohols and Amines: Synthesis of Phenyl Enol Ethers
作者:Victor Laserna、Catherine Jeapes Rojas、Tom D. Sheppard
DOI:10.1021/acs.orglett.9b01208
日期:2019.6.21
A practical method for the synthesis of phenyl enol ethers is reported. The combination of a gold(I) catalyst and potassium carbonate selectively mediates the addition of phenols to propargylic alcohols/amines in a chemo-, regio-, and stereoselective fashion in high yield. The resulting enol ethers are formed exclusively with a Z-configuration and can be obtained from a wide array of phenols and propargylic
Gold- and Silver-Catalyzed Reactions of Propargylic Alcohols in the Presence of Protic Additives
作者:Matthew N. Pennell、Peter G. Turner、Tom D. Sheppard
DOI:10.1002/chem.201102830
日期:2012.4.10
secondary and tertiary propargylicalcohols undergo a Meyer–Schusterrearrangement to give enones at room temperature in the presence of a gold(I) catalyst and small quantities of MeOH or 4‐methoxyphenylboronic acid. The syntheses of the enone natural products isoegomaketone and daphenone were achieved using this reaction as the key step. The rearrangement of primary propargylicalcohols can readily be combined
Gold-Catalyzed Oxidative Reactions of Propargylic Carbonates Involving 1,2-Carbonate Migration: Stereoselective Synthesis of Functionalized Alkenes
作者:Ning Sun、Ming Chen、Yuanhong Liu
DOI:10.1021/jo500573s
日期:2014.5.2
A gold-catalyzed oxidative reaction of propargylic carbonates or acetates using 3,5-dichloropyridine as the oxidant has been developed. The reaction provides efficient access to α-functionalized-α,β-unsaturated ketones with excellent regio- and diastereocontrol via a regioselective attack of the N-oxide to the gold-activated alkyne followed by a 1,2-carbonate migration. In addition, the alkene products
Intercepting the Gold-Catalysed Meyer-Schuster Rearrangement by Controlled Protodemetallation: A Regioselective Hydration of Propargylic Alcohols
作者:Matthew N. Pennell、Michael P. Kyle、Samantha M. Gibson、Louise Male、Peter G. Turner、Richard S. Grainger、Tom D. Sheppard
DOI:10.1002/adsc.201600101
日期:2016.4.28
acid or a boronic acid. This provides an interesting alternative to an aldol reaction when combined with the straightforward addition of an alkyne to an aldehyde or ketone. The gold-catalysed reaction of an electron-deficient, sterically hindered propargylic alcohol with a boronic acid led to the formation of an unusually stable cyclic boron enolate.
We report on a study of copper-catalyzed alkylation of internal allylic carbonates using functionalized alkyl and aryl Grignardreagents. The reactions exhibit good regioselectivity for either SN2 or SN2′ products, enabling the preparation of products with E-alkene selectivity. Density functional theory (DFT) calculations reveal the origins of the regioselectivity based on the different behaviors of
我们报告了使用官能化烷基和芳基格氏试剂铜催化内烯丙基碳酸酯烷基化的研究。该反应对S N 2 或S N 2' 产物表现出良好的区域选择性,使得能够制备具有E-烯烃选择性的产物。密度泛函理论(DFT)计算揭示了基于同铜酸盐和异铜酸盐的不同行为的区域选择性的起源。