Iridium-Catalyzed Asymmetric Hydrogenation of Unfunctionalized, Trialkyl-Substituted Olefins
作者:Aie Wang、Rui P. A. Fraga、Esther Hörmann、Andreas Pfaltz
DOI:10.1002/asia.201000595
日期:2011.2.1
Chiral iridium complexes with bicyclic pyridine‐basedN,P ligands have emerged as efficient catalysts for the enantioselective hydrogenation of unfunctionalized trialkyl‐substituted olefins. Optimization of the reaction conditions by variation of the solvent, pressure, and temperature led to enantiomeric excesses of up to 99 %. Three pure alkenes, (E)‐2‐cyclohexyl‐2‐butene and (E)‐ and (Z)‐3,4‐dimethyl‐2‐pentene
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。
Freudenberg; Lwowski, Justus Liebigs Annalen der Chemie, 1954, vol. 587, p. 220
作者:Freudenberg、Lwowski
DOI:——
日期:——
Levene; Marker, Journal of Biological Chemistry, 1931, vol. 91, p. 418
作者:Levene、Marker
DOI:——
日期:——
Tsuda et al., Chemistry and industry, 1959, p. 1411