A One-Pot Approach to Δ2-Isoxazolines from Ketones and Arylacetylenes
摘要:
The sequential reaction of ketones with arylacetylenes and hydroxylamine in the presence of KOBut/DMSO followed by the treatment of the reaction mixture with H2O and KOH leads to Delta(2)-isoxazolines in up to 88% yield.
A One-Pot Approach to Δ2-Isoxazolines from Ketones and Arylacetylenes
摘要:
The sequential reaction of ketones with arylacetylenes and hydroxylamine in the presence of KOBut/DMSO followed by the treatment of the reaction mixture with H2O and KOH leads to Delta(2)-isoxazolines in up to 88% yield.
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.