Expanding the <i>C</i><sub>2</sub>-Symmetric Bicyclo[2.2.1]hepta-2,5-diene Ligand Family: Concise Synthesis and Catalytic Activity in Rhodium-Catalyzed Asymmetric Addition
作者:Guillaume Berthon-Gelloz、Tamio Hayashi
DOI:10.1021/jo061385s
日期:2006.11.1
achieved through the formation of the corresponding stable [RhCl(diene)]2 complexes. These chiral rhodium complexes displayed high activity and enantioselectivity (up to 99% ee) in the rhodium-catalyzed 1,4-addition and 1,2-addition of phenylboronic acid to cyclic enones and N-sulfonylimines, respectively.
从容易获得的双环[2.2.1]开始,通过两步顺序制备对映体纯的新的C 2对称双环[2.2.1]庚-2,5-二烯,在2和5位带有甲基和苯基取代基。庚2,5-二酮。由于这些二烯的不稳定性或挥发性,它们的分离是通过形成相应的稳定的[RhCl(diene)] 2复合物来实现的。这些手性铑配合物分别在铑催化的苯基硼酸向环烯酮和N-磺酰亚胺类化合物的1,4-加成和1,2-加成中显示出高活性和对映选择性(高达99%ee)。