Chiral Bifunctional Phosphine-Carboxylate Ligands for Palladium(0)-Catalyzed Enantioselective C−H Arylation
作者:Lei Yang、Markus Neuburger、Olivier Baudoin
DOI:10.1002/anie.201712061
日期:2018.1.26
Previous enantioselective Pd0‐catalyzed C−H activation reactions proceeding via the concerted metalation‐deprotonation mechanism employed either a chiral ancillary ligand, a chiral base, or a bimolecular mixture thereof. This study describes the development of new chiral bifunctional ligands based on a binaphthyl scaffold which incorporates both a phosphine and a carboxylic acid moiety. The optimal
先前的对映选择性Pd 0催化的CH活化反应是通过手性辅助配体,手性碱或它们的双分子混合物通过一致的金属化-去质子化机理进行的。这项研究描述了基于双萘基支架的新手性双功能配体的开发,该萘并膦既包含膦又包含羧酸部分。最佳配体为解对称的C(sp 2)-H芳基化反应提供了高收率和对映选择性,从而导致5,6-二氢菲啶,而相应的单官能配体显示出低对映选择性。事实证明,该双功能体系适用于一系列取代的二氢菲啶,并允许消旋底物的平行动力学拆分。