Highly Stereoselective Synthesis of Conjugated Polyenes via a Homocoupling Reaction of Unsaturated Silanes
作者:Francesco Babudri、Angela R. Cicciomessere、Gianluca M. Farinola、Vito Fiandanese、Giuseppe Marchese、Roberta Musio、Francesco Naso、Oronzo Sciacovelli
DOI:10.1021/jo9700437
日期:1997.5.1
A new method for the synthesis of conjugated polyenes containing up to eight double bonds with all-E configuration is reported. The procedure is based upon a homocoupling reaction of dienyl-, trienyl-, or tetraenylsilanes, promoted by PdCl(2) in methanol and in the presence of LiCl and CuCl(2). Configurational and conformational assignments were rigorously made on the basis of NMR spectra. The compounds
报道了一种新的合成共轭多烯的新方法,该共轭多烯含有多达8个全E构型的双键。该程序基于PdCl(2)在甲醇中以及在LiCl和CuCl(2)的存在下,二烯基,三烯基或四烯基硅烷的均偶联反应。在NMR光谱的基础上严格进行构型和构象分配。获得的化合物代表了一类新颖的有趣的对称取代的多烯,具有潜在的光学和电光学特性。通过改变溶剂,可以将均偶联过程切换为甲硅烷基取代的末端双键的卤化反应,从而导致聚烯基卤化物。