Cobalt-catalyzed mono-coupling of R 3 SiCH 2 MgCl with 1,2-dihalogenoethylene: a general route to γ-substituted ( E )-allylsilanes
作者:Taku Kamachi、Akiko Kuno、Chikashi Matsuno、Sentaro Okamoto
DOI:10.1016/j.tetlet.2004.04.098
日期:2004.6
um chloride (TMSCH2MgCl) with 1,2-dihalogenoethylene in the presence of 1 mol % of Co(II) or Co(III) acetylacetonate in THF or THF–NMP proceeded exclusively in a mono-coupling pathway to provide 3-trimethylsilyl-1-halogeno-1-propene with >99% of E geometry in high yield, which was converted to a variety of γ-substituted allylsilanes by Ni- or Pd-catalyzed coupling with organometallic compounds.
三甲基甲硅烷基甲基氯化镁(TMSCH 2 MgCl)与1,2-二卤代乙烯在THF或THF-NMP中存在1 mol%的乙酰丙酮化Co(II)或Co(III)的反应仅通过单偶联途径进行具有> 99%E几何形状的3-三甲基甲硅烷基-1-卤代-1-丙烯,收率高,可通过Ni-或Pd催化与有机金属化合物的偶合反应转化为各种γ-取代的烯丙基硅烷。