Iridium Catalysts with Chiral Bicyclic Pyridine-Phosphane Ligands for the Asymmetric Hydrogenation of Olefins
作者:Xu Quan、Vijay Singh Parihar、Milan Bera、Pher G. Andersson
DOI:10.1002/ejoc.201301141
日期:2014.1
New bicyclic pyridine-phosphane ligands were prepared, and their iridium complexes were evaluated in asymmetric hydrogenation of trisubstituted olefins with non-coordinating and weakly coordinating ...
Iridium Catalysts with Chiral Imidazole-Phosphine Ligands for Asymmetric Hydrogenation of Vinyl Fluorides and other Olefins
作者:Päivi Kaukoranta、Mattias Engman、Christian Hedberg、Jonas Bergquist、Pher G. Andersson
DOI:10.1002/adsc.200800062
日期:2008.5.5
New chiral bidentate imidazole-phosphine ligands have been prepared and evaluated for the iridium-catalysed asymmetric hydrogenation of olefins. The imidazole-phosphine-ligated iridiumcatalysts hydrogenated trisubstituted olefins with the same sense of enantiodiscrimination as known iridiumcatalysts possessing oxazole and thiazole as N-donors. The imidazole-based catalysts were shown to hydrogenate
A Phosphite-Pyridine/Iridium Complex Library as Highly Selective Catalysts for the Hydrogenation of Minimally Functionalized Olefins
作者:Javier Mazuela、Oscar Pàmies、Montserrat Diéguez
DOI:10.1002/adsc.201201017
日期:2013.9.16
library of readily available phosphite‐pyridine ligands has been successfully applied for the first time in the iridium‐catalyzed asymmetric hydrogenation of a broad range of minimallyfunctionalizedolefins. The modular ligand design has been shown to be crucial in finding highly selective catalytic systems for each substrate. Excellent enantioselectivities (ees up to 99%) have therefore been obtained
Adaptative Biaryl Phosphite-Oxazole and Phosphite-Thiazole Ligands for Asymmetric Ir-Catalyzed Hydrogenation of Alkenes
作者:Javier Mazuela、Alexander Paptchikhine、Oscar Pàmies、Pher G. Andersson、Montserrat Diéguez
DOI:10.1002/chem.200903350
日期:2010.4.19
library of readily available phosphite–oxazole/thiazole ligands (L1 a–g–L7 a–g) was applied in the Ir‐catalyzed asymmetrichydrogenation of several largely unfunctionalized E‐ and Z‐trisubstituted and 1,1‐disubstituted terminal alkenes. The ability of the catalysts to transfer chiral information to the product could be tuned by choosing suitable ligand components (bridge length, the substituents in the
一个易得的亚磷酸酯-恶唑/噻唑配体库(L1 a – g – L7 a – g)被用于Ir催化的几个未官能化的E和Z的不对称加氢反应中-三取代和1,1-二取代的末端烯烃。可以通过选择合适的配体组分(桥长,杂环和烷基主链上的取代基,配体主链的构型以及烯丙基中的取代基/构型)来调节催化剂将手性信息传递给产物的能力。亚磷酸亚芳基酯部分),因此可以根据需要使每种底物的对映选择性最大化。因此,对于多种E-和Z-三取代和1,1-二取代的末端烯烃,对映选择性极好(对映体过量(ee)值> 99%)。就底物的多功能性而言,亚磷酸亚芳基酯部分是非常有利的配体组分。
A Modular Furanoside Thioether-Phosphite/Phosphinite/ Phosphine Ligand Library for Asymmetric Iridium-Catalyzed Hydrogenation of Minimally Functionalized Olefins: Scope and Limitations
作者:Mercedes Coll、Oscar Pàmies、Montserrat Diéguez
DOI:10.1002/adsc.201200711
日期:2013.1.14
thioether‐phosphite/phosphinite/phosphine ligand library has been synthesized for the iridium‐catalyzed asymmetric hydrogenation of minimallyfunctionalizedolefins. These ligands can be prepared efficiently from easily accessible D‐(+)‐xylose. We found that their effectiveness at transferring the chiral information in the product can be tuned by correctly choosing the ligand components. Enantioselectivities were