Transition Metal-Free Stereoselective α-Vinylation of Cyclic Ketones with Arylacetylenes in the Superbasic Catalytic Triad Potassium Hydroxide/tert-Butyl Alcohol/Dimethyl Sulfoxide
作者:Boris A. Trofimov、Elena Yu. Schmidt、Nadezhda V. Zorina、Elena V. Ivanova、Igor' A. Ushakov、Al'bina I. Mikhaleva
DOI:10.1002/adsc.201200210
日期:2012.6.18
A stereoselective α‐vinylation of cycloaliphatic ketones with arylacetylenes under the transition metal‐free conditions has been developed. The reaction is promoted by the superbasic catalytic triad potassium hydroxide/tert‐butyl alcohol/dimethyl sulfoxide (80–110 °C, 1–2 h) to afford mainly (E)‐β,γ‐ethylenic ketones, their (E)‐α,β‐isomers being minor products, in up to 83% total yield.
在无过渡金属的条件下,开发了芳基乙炔与脂环族酮的立体选择性α-乙烯基化。超碱性催化三联体氢氧化钾/叔丁醇/二甲亚砜(80-110°C,1-2 h)促进反应,主要得到(E)-β,γ-烯键,及其(E)- α,β-异构体是次要产品,总收率高达83%。