Development of the Suzuki−Miyaura Cross-Coupling Reaction: Use of Air-Stable Potassium Alkynyltrifluoroborates in Aryl Alkynylations
作者:Gary A. Molander、Bryson W. Katona、Fouzia Machrouhi
DOI:10.1021/jo0262356
日期:2002.11.1
cross-coupling reaction of potassiumalkynyltrifluoroborates with aryl halides or triflates proceeds readily with moderate to excellent yields. The potassiumalkynyltrifluoroborates are air- and moisture-stable crystalline solids that can be stored indefinitely, which will provide an advantage in applications to combinatorial chemistry. The alkynyl cross-coupling reaction can be effected using 9 mol % of PdCl2(dppf)
Ni-Catalyzed deaminative hydroalkylation of internal alkynes
作者:Ze-Fan Zhu、Jia-Lin Tu、Feng Liu
DOI:10.1039/c9cc05385a
日期:——
A regioselective cis-hydroalkylation of internal alkynes with readily prepared Katritzky pyridinium salts for the synthesis of tri-substituted alkenes is described. This reaction is the first example of a metal-catalyzed hydroalkylation of an alkynevia C–N bond activation of an amine. The reaction demonstrates broad scope and functional group tolerance, allowing access to desired products with high
Visible-light-enabled aerobic synthesis of benzoin bis-ethers from alkynes and alcohols
作者:Wen-Long Lei、Biao Yang、Qing-Bao Zhang、Pan-Feng Yuan、Li-Zhu Wu、Qiang Liu
DOI:10.1039/c8gc02766h
日期:——
atom-economical and good regioselective method for the synthesis of benzoin bis-ethers has been developed via directly using readily available alkynes and alcohols as raw materials under visible light irradiation. The protocol utilizes commercial Mes-Acr+ClO4− as an organophotoredox catalyst and air (O2) as a green sustainable reagent. A range of benzoin bis-ether derivatives were easily and efficiently obtained
carboxyzincation reactions employing carbondioxide and zinc metal powder are developed. By using alkynes as substrates, regio- and stereodefined (Z)-β-zincated acrylates are provided. The corresponding alkenylzinc moiety can be converted to various substituents, affording multisubstituted acrylic acids. Furthermore, by adding electron-deficient alkene to the reaction system, the four-component coupling reactions