Enantioselective Transfer Hydrogenation of Aliphatic Ketones Catalyzed by Ruthenium Complexes Linked to the Secondary Face of β-Cyclodextrin
作者:Alain Schlatter、Wolf-D. Woggon
DOI:10.1002/adsc.200700558
日期:2008.5.5
Ruthenium-η-arene complexes attached to the secondary face of β-cyclodextrin catalyze the enantioselective reduction (ee up to 98%) of aliphatic and aromatic ketones in aqueous medium in the presence of sodium formate (HCOONa).
Application of Tethered Ruthenium Catalysts to Asymmetric Hydrogenation of Ketones, and the Selective Hydrogenation of Aldehydes
作者:Katherine E. Jolley、Antonio Zanotti‐Gerosa、Fred Hancock、Alan Dyke、Damian M. Grainger、Jonathan A. Medlock、Hans G. Nedden、Jacques J. M. Le Paih、Stephen J. Roseblade、Andreas Seger、Vilvanathan Sivakumar、Ivan Prokes、David J. Morris、Martin Wills
DOI:10.1002/adsc.201200362
日期:2012.9.17
An improved method for the synthesis of tethered ruthenium(II) complexes of monosulfonylated diamines is described, together with their application to the hydrogenation of ketones and aldehydes. The complexes were applied directly, in their chloride form, to asymmetric ketone hydrogenation, to give products in excess of 99% ee in the best cases, using 30 bar of hydrogen at 60 °C, and to the selective
Transition metal nanoparticles stabilized by ammonium salts of hyperbranched polystyrene: effect of metals on catalysis of the biphasic hydrogenation of alkenes and arenes
作者:Lei Gao、Keisuke Kojima、Hideo Nagashima
DOI:10.1016/j.tet.2015.04.081
日期:2015.9
an excellent stabilizer of ruthenium, rhodium, iridium, palladium, and platinum nanoparticles from 1 to 3 nm in size uniformly dispersed in the polymer matrix. The catalytic performance of the resulting metal-polymer composites, [email protected]3+Cl−, is dependent on the metal. This dependence was investigated by assessing the hydrogenation of alkenes and arenes. The utility of [email protected]3+Cl−
Brønsted Acid Catalyzed Asymmetric Reduction of Ketones and Acyl Silanes Using Chiral <i>anti</i>-Pentane-2,4-diol
作者:Jun-ichi Matsuo、Yu Hattori、Hiroyuki Ishibashi
DOI:10.1021/ol1006532
日期:2010.5.21
Ketones and acyl silanes were reduced to the corresponding alcohols by a simple procedure employing anti-1,3-diol and a catalytic amount (5 mol %) of 2,4-dinitrobenzenesulfonic acid in benzene at reflux. Asymmetric induction reached up to >99% ee when a chiral pentane-2,4-diol of 97% ee was used.
ATH reductions of aliphaticketones in water catalyzed by ruthenium coordinated by prolinamide ligands produce alcohols with moderate enantiomeric excesses in most cases. A set of seven aliphaticketones is proposed for a rapid evaluation of the enantioselectivity of catalysts by one-pot multi-substrates reduction. The screening of a library of prolinamides shows that according to the structure of