Towards the Limit of Atropochiral Stability: H-MIOP, an N-Heterocyclic Carbene Precursor and Cationic Analogue of the H-MOP Ligand
作者:Ibrahim Abdellah、Martial Boggio-Pasqua、Yves Canac、Christine Lepetit、Carine Duhayon、Remi Chauvin
DOI:10.1002/chem.201100205
日期:2011.4.26
addressed for the 1‐naphthyl‐N‐benzimidazolyl motif substituted by a single diphenylphosphinyl group at the 2‐position. The atropoenantiomers of the N‐methylated cation H‐MIOP, a less sterically locked analogue of the neutral H‐MOP ligand, were resolved by enantiospecific cleavage of the N2CP bond of the resolved enantiomers of BIMIONAP. The latter were obtained by enantiospecific N‐methylation of the previously
联芳基序的构型稳定性适用于1-萘基-N-苯并咪唑基基序在2-位被单个二苯基次膦酰基取代的基序。N-甲基化的阳离子H-MIOP,中性H-MOP配体的空间位少锁定类似物的atropoenantiomers,由所述N个的对映体特异性裂解解决2 ç BIMIONAP的拆分对映体的对键。后者是通过中性BIMINAP先前解析的对映异构体的对映体特异性N-甲基化获得的。P,C-螯合的N-杂环卡宾(NHC)-膦配体的PdCl 2配合物,其衍生自(R)-和(S由N:)-H-MIOP通过两种对映体特异性途径制备2 ç 从(P键断裂- [R )-和(小号)-BIMIONAP-的PdCl 2层的复合物,或者通过与在碳原子的P的同时协调原位生成游离的NHC-膦。H-MOP,H-MIOP和相应的NHC-膦的对映异构途径已在B3PW91 / 6-31G(d,p)的理论水平上进行了研究。乙腈中H-MOP和H-MIOP的对映异构势垒的计算值分别为176