Cobalt-Catalyzed Regio- and Enantioselective Markovnikov 1,2-Hydrosilylation of Conjugated Dienes
作者:Huanan Wen、Kuan Wang、Yanlu Zhang、Guixia Liu、Zheng Huang
DOI:10.1021/acscatal.8b04481
日期:2019.2.1
2-Markovnikov hydrosilylation of conjugated dienes with primary silanes catalyzed by a quinoline-oxazoline cobalt complex has been described. This protocol provides an efficient approach to chiral allyl dihydrosilanes with high regioselectivity and enantioselectivity (up to 96% ee). The catalyst system is effective for a wide array of conjugated dienes, including mono- and 1,2-disubstituted dienes with aryl
已经描述了通过喹啉-恶唑啉钴配合物催化的共轭二烯与伯硅烷的不对称1,2-Markovnikov氢化硅烷化。该方案为手性烯丙基二氢硅烷提供了一种高效方法,具有高区域选择性和对映选择性(最高96%ee)。该催化剂体系对于各种各样的共轭二烯是有效的,包括具有芳基和/或烷基取代基的单-和1,2-二取代的二烯。进一步地,使用吡啶-恶唑啉钴催化的对苯二甲酸逐步增长聚合反应,将产物用于合成含有对映体富集的烯丙基官能团的侧链的聚有机硅氧烷(有机硅共聚物)。涉及PhSiD 3反应的氘标记实验的结果 1,3-戊二烯表明,氢化硅烷化最有可能通过改良的Chalk-Harrod机理进行,该机理涉及将二烯的末端双键1,2-插入Co-Si键。