Ligand-Controlled, Complementary Stereoselectivity in the Platinum-Catalyzed Intramolecular Silaboration of Alkenes
作者:Toshimichi Ohmura、Hideki Furukawa、Michinori Suginome
DOI:10.1021/ja065588+
日期:2006.10.1
An intramolecular silaboration of borylsilanyl homoallyl ethers was achieved using a platinum catalyst, giving 1-oxa-2-silacyclopentanes in high yields. The stereoselectivity of the reactions of sec-homoallyl ethers strongly depended on the phosphorus ligand of the platinum catalysts used. The platinum complex bearing the PCyPh2 ligand was found to be the most trans-selective catalyst (trans/cis =
使用铂催化剂实现硼基硅烷基高烯丙基醚的分子内硅化,以高产率得到 1-oxa-2-硅杂环戊烷。仲-高烯丙基醚反应的立体选择性很大程度上取决于所用铂催化剂的磷配体。发现带有 PCyPh2 配体的铂配合物是最具反式选择性的催化剂 (trans/cis = 81:19-92:8),而使用具有 tris(2,4 -二叔丁基苯基)亚磷酸酯配体(反式/顺式 = 8:92-6:94)。6-甲基庚烷-1,3,5-三醇的一对非对映异构体的互补合成证明了分子内硅化的合成效用。