Mechanism of the Asymmetric Hydrogenation of Exocyclic α,β-Unsaturated Carbonyl Compounds with an Iridium/BiphPhox Catalyst: NMR and DFT Studies
作者:Yuanyuan Liu、Ilya D. Gridnev、Wanbin Zhang
DOI:10.1002/anie.201309677
日期:2014.2.10
mechanism of the asymmetric hydrogenation of exocyclicα,β‐unsaturated carbonyl compounds with the (aS)‐Ir/iPr‐BiphPhox catalyst was studied by NMR experiments and DFT computational analyses. Computed optical yields of the asymmetric hydrogenation proceeding by an iridium(I)/iridium(III) mechanism involving a transition state stabilized through two intramolecular hydrogen bonds are in good accordance
通过NMR实验和DFT计算分析研究了(aS)-Ir / i Pr-BiphPhox催化剂对环外α,β-不饱和羰基化合物不对称氢化的机理。通过铱(I)/铱(III)机理进行的涉及通过两个分子内氢键稳定的过渡态的不对称氢化的计算光学收率与实验ee 值非常一致。
P-Stereogenic Ir-MaxPHOX: A Step toward Privileged Catalysts for Asymmetric Hydrogenation of Nonchelating Olefins
作者:Maria Biosca、Pol de la Cruz-Sánchez、Jorge Faiges、Jèssica Margalef、Ernest Salomó、Antoni Riera、Xavier Verdaguer、Joan Ferré、Feliu Maseras、Maria Besora、Oscar Pàmies、Montserrat Diéguez
DOI:10.1021/acscatal.2c05579
日期:2023.3.3
The Ir-MaxPHOX-type catalysts demonstrated high catalytic performance in the hydrogenation of a wide range of nonchelating olefins with different geometries, substitution patterns, and degrees of functionalization. These air-stable and readily available catalysts have been successfully applied in the asymmetrichydrogenation of di-, tri-, and tetrasubstitutedolefins (ee′s up to 99%). The combination
Ir-MaxPHOX 型催化剂在各种具有不同几何形状、取代模式和功能化程度的非螯合烯烃的加氢中表现出高催化性能。这些空气稳定且易于获得的催化剂已成功应用于二、三和四取代烯烃(ee 高达 99%)的不对称氢化。理论计算和氘标记实验相结合,揭示了导致反应中观察到的对映选择性的因素,从而使这些 Ir 催化剂的最合适底物合理化。