The carbonylation of alkanes 1 under radical-reaction conditions was examined by using ethynyl triflone A as the unimolecular chain-transfer (UMCT) reagent. Good to moderate yields of ethynylketones 2 were prepared by means of this three-component coupling reaction. Higher CO pressures as well as lower concentrations of triflone A improved the efficiency of the reaction over the direct addition, the
Copper-Catalyzed Cross-Coupling of Alkyl and Aryl Grignard Reagents with Alkynyl Halides
作者:Gérard Cahiez、Olivier Gager、Julien Buendia
DOI:10.1002/anie.200905816
日期:——
Good old copper! A new general procedure to couple aliphatic and aromatic Grignardreagents with alkynyl halides under copper catalysis is described (see scheme; NMP=N‐methylpyrrolidinone). The reaction is chemoselective and allows preparation of a vast array of simple and functionalized internal alkynes in high yields.