Elevated Catalytic Activity of Ruthenium(II)-Porphyrin-Catalyzed Carbene/Nitrene Transfer and Insertion Reactions with N-Heterocyclic Carbene Ligands
作者:Ka-Ho Chan、Xiangguo Guan、Vanessa Kar-Yan Lo、Chi-Ming Che
DOI:10.1002/anie.201309888
日期:2014.3.10
characterized. Owing to the strong donor strength of axial NHC ligands in stabilizing the trans MCRR′/MNR moiety, these complexes showed unprecedently high catalytic activity towards alkene cyclopropanation, carbene CH, NH, SH, and OH insertion, alkene aziridination, and nitrene CH insertion with turnover frequencies up to 1950 min−1. The use of chiral [Ru(D4‐Por)(BIMe)2] (1 g) as a catalyst led to
设计,合成和表征了双(NHC)钌(II)-卟啉配合物。由于轴向NHC的强供体强度在稳定配体的反式MCRR'/MNR部分,这些配合物显示出对烯烃环丙烷化unprecedently高的催化活性,卡宾Ç H,N H,S H,和O H插入,烯基叠氮化和亚硝基CH插入,其周转频率高达1950 min -1。手性[Ru(D 4 -Por)(BIMe)2 ](1 g)的使用导致高对映选择性卡宾/丁二烯转移和插入反应的发生率高达98% ee。在37°C时可以对肽的N末端进行碳烯修饰。DFT计算表明,反式NHC配体通过稳定金属-卡宾反应中间体来促进重氮化合物的分解。