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.
Transition-Metal-Free Superbase-Promoted Stereoselective α-Vinylation of Ketones with Arylacetylenes: A General Strategy for Synthesis of β,γ-Unsaturated Ketones
作者:Boris A. Trofimov、Elena Yu. Schmidt、Nadezhda V. Zorina、Elena V. Ivanova、Igor' A. Ushakov
DOI:10.1021/jo301005p
日期:2012.8.17
A wide variety of beta,gamma-unsaturated ketones of E configuration have been obtained in good to excellent yields via (KOBu)-Bu-t/DMSO promoted alpha-vinylation of aliphatic, cycloaliphatic, and alkyl aromatic (heteroaromatic) ketones with diverse arylacetylenes.