Catalytic Asymmetric C–H Arylation of (η<sup>6</sup>-Arene)Chromium Complexes: Facile Access to Planar-Chiral Phosphines
作者:María Batuecas、Junfei Luo、Ivana Gergelitsová、Katrina Krämer、Daniel Whitaker、Iñigo J. Vitorica-Yrezabal、Igor Larrosa
DOI:10.1021/acscatal.9b00918
日期:2019.6.7
hemilabile ligand H8-BINAP(O) is key to providing high enantioselectivity in this transformation. We show that this methodology opens the door to the synthesis of a variety of planar-chiral chromium derivatives which can be easily transformed into planar chiral mono- or diphosphines. Mechanistic studies, including synthesis and characterization of Pd and Ag complexes and their detection in the reaction mixture
报道了(η6-芳烃)铬配合物的催化不对称直接CH芳基化反应以获得平面手性化合物。半不稳定配体H8-BINAP(O)的使用是在此转化过程中提供高对映选择性的关键。我们表明,该方法学为各种平面-手性铬衍生物的合成打开了大门,这些衍生物可以很容易地转化为平面的手性单膦或二膦。包括Pd和Ag配合物的合成和表征以及它们在反应混合物中的检测在内的机理研究表明,Pd催化/ Ag促进的催化系统由Ag进行CH活化步骤。