New monoterpene-derived phosphinopyridine ligands and their application in the enantioselective iridium-catalyzed hydrogenation
作者:Giorgio Chelucci、Mauro Marchetti、Andrei V. Malkov、Frédéric Friscourt、Martin E. Swarbrick、Pavel Kočovský
DOI:10.1016/j.tet.2011.05.075
日期:2011.7
derivatives with a phosphine or phosphinite pendant (1–11) have been synthesized from (+)-α-pinene, (−)-isopinocampheol, and/or (+)-camphor via Kröhnke annulation or another annulation method as the key step for the construction of the pyridine nucleus. The iridium complex of 6 proved to catalyzehydrogenation of the prochiral unfunctionalized alkene 44 with 94% ee, whereas the complex of 2 was most efficient
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
A Theoretically-Guided Optimization of a New Family of Modular P,S-Ligands for Iridium-Catalyzed Hydrogenation of Minimally Functionalized Olefins
作者:Jèssica Margalef、Xisco Caldentey、Erik A. Karlsson、Mercè Coll、Javier Mazuela、Oscar Pàmies、Montserrat Diéguez、Miquel A. Pericàs
DOI:10.1002/chem.201402978
日期:2014.9.15
thioether‐phosphite/phosphiniteligands has been evaluated in the asymmetric iridium‐catalyzedhydrogenation of minimallyfunctionalizedolefins. The modular ligand design has been shown to be crucial in finding highly selective catalysts for each substrate. A DFT study of the transition state responsible for the enantiocontrol in the Ir‐catalyzedhydrogenation is also described and used for further optimization