Synthesis of new derivatives of copper complexes of Josiphos family ligands for applications in asymmetric catalysis
作者:R. Oost、J. Rong、A. J. Minnaard、S. R. Harutyunyan
DOI:10.1039/c4cy00180j
日期:——
A series of new copper complexes containing chiral ferrocenyl diphosphine ligands of the Josiphos family have been prepared. These complexes have been studied in the catalytic asymmetric 1,2-addition of Grignard reagents to enones and aromatic ketones. Variation of the electronic and steric properties of the ligand resulted in a positive effect in the regio- and enantioselectivity of Grignard reagents
已经制备了一系列含有Josiphos家族的手性二茂铁基二膦配体的新的铜配合物。这些配合物已经在格氏试剂到烯酮和芳族酮的催化不对称1,2-加成中进行了研究。配体的电子和空间特性的变化对格氏试剂对α- H-取代的烯酮的区域和对映体选择性产生积极影响,其中叔酸在二芳基膦部分中引入了丁基取代基。铜配合物也成功地用于格氏试剂对烯酸酯的催化不对称共轭加成中。与线性配体rev-Josiphos相比,线性格氏试剂的催化不对称加成没有观察到对映选择性的提高。