A New Class of Tunable Dendritic Diphosphine Ligands: Synthesis and Applications in the Ru-Catalyzed Asymmetric Hydrogenation of Functionalized Ketones
作者:Baode Ma、Tingting Miao、Yihua Sun、Yanmei He、Ji Liu、Yu Feng、Hui Chen、Qing-Hua Fan
DOI:10.1002/chem.201402709
日期:2014.8.4
dendritic 2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl (BINAP) ligands was prepared by attaching polyaryl ether dendrons onto the four phenyl rings on the P atoms. Their ruthenium complexes were employed in the asymmetric hydrogenation of β‐ketoesters, α‐ketoesters, and α‐ketoamides to reveal the effects of dendron size on the catalytic properties. The second‐ and third‐generation catalysts exhibited excellent
一系列可调的G 0 –G 3树枝状2,2'-双(二苯基膦基)-1,1'-联萘(BINAP)配体是通过将聚芳基醚树枝状分子连接到P原子上的四个苯环上而制备的。他们的钌配合物用于β-酮酸酯,α-酮酸酯和α-酮酰胺的不对称氢化反应,揭示了树枝状分子大小对催化性能的影响。第二代和第三代催化剂表现出优异的对映选择性,明显高于从小分子催化剂和第一代催化剂获得的对映选择性。分子模型表明,大的树枝状楔形物的结合会影响金属中心周围的空间环境。此外,