Bis(perfluoroalkyl) Phosphino-Oxazoline: A Modular, Stable, Strongly π-Accepting Ligand for Asymmetric Catalysis
作者:Zongjian Hu、Yuguang Li、Kai Liu、Qilong Shen
DOI:10.1021/jo3011717
日期:2012.9.21
A new class of stable, strongly π-accepting and modular bis(perfluoroalkyl)-phosphine-oxazoline ligands (FOX) as CO mimics was prepared. It was demonstrated that these ligands, when coordinated to palladium catalysts, promote the asymmetric alkylation of monosubstituted allyl substrates with excellent regio- and enantioselectivity. Solid and solution structure analysis of the FOX-ligated Pd-allyl intermediate
制备了一类新的稳定,强π-接受和模块化的双(全氟烷基)-膦-恶唑啉配体(FOX),作为CO模拟物。结果表明,这些配体与钯催化剂配位时,可促进单取代烯丙基底物的不对称烷基化,并具有出色的区域选择性和对映选择性。对FOX-连接的Pd-烯丙基中间体的固相和溶液结构分析表明,P(CF 3)2部分所呈现的相对空间和强反式影响的组合产生了极好的选择性。