Nickel‐Catalyzed Allylmethylation of Alkynes with Allylic Alcohols and AlMe
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: Facile Access to Skipped Dienes and Trienes
作者:Wanfang Li、Shun Yu、Jincan Li、Yu Zhao
DOI:10.1002/anie.202006322
日期:2020.8.17
herein an unprecedented allylative dicarbofunctionalization of alkynes with allylic alcohols. This simple catalytic procedure utilizes commercially available Ni(COD)2, triphenylphosphine, and inexpensive reagents, and delivers valuable skipped dienes and trienes with an all‐carbontetrasubstitutedalkeneunit in a highly stereoselective fashion. Preliminary mechanistic studies support the reaction pathway
Z-selective dimerization of terminal alkynes by a (PNNP)FeII complex
作者:Jeremiah E. Stevens、Justin D. Miller、Matthew C. Fitzsimmons、Curtis E. Moore、Christine M. Thomas
DOI:10.1039/d4cc00469h
日期:——
A tetradentate bis(amido)bis(phosphine) FeII complex, (PNNP)Fe, is shown to activate the terminal C–H bond of aryl alkynes across its Fe–Namide bonds. (PNNP)Fe is also shown to catalytically dimerize terminal aryl alkynes to produce 1,3-enynes with Z : E ratios as high as 96 : 4 with yields up to 95% and loadings as low as 1 mol% at 30 °C in 2 h. A plausible metal–ligand cooperative mechanism invoking