Highly Regioselective Allylic Substitution Reactions Catalyzed by an Air-Stable (π-Allyl)iridium Complex Derived from Dinaphthocyclooctatetraene and a Phosphoramidite Ligand
作者:Shu-Li You、Ke-Yin Ye、Zhuo-An Zhao、Zeng-Wei Lai、Li-Xin Dai
DOI:10.1055/s-0033-1339187
日期:——
dinaphthocyclooctatetraene and a phosphoramidite ligand has been synthesized and found to be highly efficient in iridium-catalyzed allylicsubstitution reactions. This catalyst features excellent regioselectivity and high stability. When NaCH(CO2Me)2 was used as the nucleophile, the catalyst loading in allylic alkylation reactions can be as low as 0.01 mol%. An air-stable (π-allyl)iridium complex derived
Ir-Catalysed Asymmetric Allylic Substitutions with Cyclometalated (Phosphoramidite)Ir Complexes-Resting States, Catalytically Active (π-Allyl)Ir Complexes and Computational Exploration
作者:Jevgenij A. Raskatov、Stephanie Spiess、Christian Gnamm、Kerstin Brödner、Frank Rominger、Günter Helmchen
DOI:10.1002/chem.200903465
日期:2010.6.11
Mechanistic aspects of allylicsubstitutions with iridium catalysts derived from phosphoramidites by cyclometalation were investigated. The determination of resting states by 31P NMR spectroscopy led to the conclusion that the cyclometalation process is reversible. A novel, one‐pot procedure for the preparation of (π‐ allyl)Ircomplexes was developed, and these complexes were characterised by X‐ray
研究了通过环金属化衍生自亚磷酰胺的铱催化剂进行烯丙基取代的机理。通过31 P NMR光谱法测定静止态得出的结论是环金属化过程是可逆的。开发了一种新颖的一锅法制备(π-烯丙基)Ir配合物,并通过X射线晶体结构分析和光谱数据对这些配合物进行了表征。它们是烯丙基取代反应的全活性催化剂。对烯丙基配合物,烯丙基取代基的过渡态和产物烯烃配合物的DFT计算提供了进一步的机理见解。