Development of Chiral <i>C</i><sub>2</sub>-Symmetric <i>N</i>-Heterocyclic Carbene Rh(I) Catalysts through Control of Their Steric Properties
作者:Marc-Antoine Abadie、Kirsty MacIntyre、Cédric Boulho、Peter Hoggan、Frédéric Capet、Francine Agbossou-Niedercorn、Christophe Michon
DOI:10.1021/acs.organomet.8b00823
日期:2019.1.28
Chiral square-planar Rh(I) complexes based on new C2-symmetric NHC ligands have been synthesized selectively in a few steps as single diastereoisomers. These chiral precatalysts were applied to the asymmetric transfer hydrogenation of 1-phenylpropanone and to the 1,2-addition of arylboronic acids to aldehydes. We demonstrated a proper functionalization of the aromatic rings connected to the nitrogen
基于新的C 2对称NHC配体的手性方平面Rh(I)配合物已在几个步骤中选择性合成为单一非对映异构体。这些手性预催化剂被用于1-苯基丙酮的不对称转移氢化以及芳基硼酸与醛的1,2-加成反应。我们证明连接到NHC配体的氮原子的芳环的适当功能化显着改善了手性Rh(I)NHC催化剂的不对称诱导。庞大的取代基可以更好地控制催化剂象限的空间特征,因为它们表现为NHC手性骨架的构象和手性中继。