Rational Optimization of Supramolecular Catalysts for the Rhodium-Catalyzed Asymmetric Hydrogenation Reaction
作者:Julien Daubignard、Remko J. Detz、Anne C. H. Jans、Bas de Bruin、Joost N. H. Reek
DOI:10.1002/anie.201707670
日期:2017.10.9
Rational design of catalysts for asymmetric transformations is a longstanding challenge in the field of catalysis. In the current contribution we report a catalyst in which a hydrogen bond between the substrate and the catalyst plays a crucial role in determining the selectivity and the rate of the catalytichydrogenation reaction, as is evident from a combination of experiments and DFT calculations
Phosphine Oxide Based Supramolecular Ligands in the Rhodium-Catalyzed Asymmetric Hydrogenation
作者:Julien Daubignard、Remko J. Detz、Bas de Bruin、Joost N. H. Reek
DOI:10.1021/acs.organomet.9b00484
日期:2019.10.28
and DFT calculations revealed the formation of strong hydrogen bonding between the two ligands. The complexes have been evaluated in the hydrogenation of several functionalized alkenes, leading to very high enantioselectivity for the substrates bearing a hydroxyl group. Also, kinetic studies showed that enhanced reaction rates of hydrogenation are observed in comparison with the supramolecular catalytic
作者:Pierre-Alain R. Breuil、Frederic W. Patureau、Joost N. H. Reek
DOI:10.1002/anie.200806177
日期:2009.3.9
catalysts! A single hydrogen bond between ligands coordinated to a rhodium center is critical for the formation of pure supramolecular catalysts for asymmetric hydrogenationreactions. The ester group of the amidite ligand (see scheme) also forms a hydrogen bond with the coordinated substrate. Use of the heterocomplex afforded the highest enantioselectivity reported to date for the hydrogenation of several
Amino Acid Based Phosphoramidite Ligands for the Rhodium-Catalyzed Asymmetric Hydrogenation
作者:Pierre-Alain R. Breuil、Joost N. H. Reek
DOI:10.1002/ejoc.200901044
日期:2009.12
were obtained; up to 97 % ee is obtained for the asymmetric hydrogenation of 4 with Sb-1e. For ligands with two sources of chirality match/mismatcheffects are observed, the diastereoisomer Sb-1b giving higher selectivity than the diastereoisomer Rb-1b for most of the substrates. The set of phosphoramidite ligands having the flexible and cheap biphenol backbone is developed to study the ability of the