Generation of a Silylethylene−Titanium Alkoxide Complex. A Versatile Reagent for Silylethylation and Silylethylidenation of Unsaturated Compounds
作者:Ryo Mizojiri、Hirokazu Urabe、Fumie Sato
DOI:10.1021/jo000925x
日期:2000.9.1
(Trimethylsilyl)ethylene-titanium alkoxide complex (1) was generated from trimethyl(vinyl)silane, Ti(O-i-Pr)(4), and i-PrMgCl as a preformed alkene-titanium complex and reacted with several unsaturated compounds such as aldehyde, imine, other vinylsilane, and acetylene to give the corresponding coupling products 4a-f, 6, 8, and 10a-d in a regioselective manner. Both of the two carbon-titanium bonds
由三甲基(乙烯基)硅烷,Ti(Oi-Pr)(4)和i-PrMgCl作为预制的烯烃-钛络合物生成(三甲基甲硅烷基)乙烯-钛醇盐络合物(1),并与几种不饱和化合物如醛反应,亚胺,其他乙烯基硅烷和乙炔以区域选择性方式得到相应的偶联产物4a-f,6、8和10a-d。配合物1的两个碳-钛键都与酯连续反应,得到甲硅烷基环丙醇11a-j,13和15,在β-甲硅烷基酮16和环丙烯17的制备中说明了它们的一些合成应用。将1的化合物与手性的酰基恶唑烷酮19结合,得到50%ee的光学活性环丙醇(+)-11a。