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).
Dynamic Kinetic Resolution of Alcohols by Enantioselective Silylation Enabled by Two Orthogonal Transition‐Metal Catalysts
作者:Jan Seliger、Martin Oestreich
DOI:10.1002/anie.202010484
日期:2021.1.4
A nonenzymatic dynamic kinetic resolution of acyclic and cyclic benzylic alcohols is reported. The approach merges rapid transition‐metal‐catalyzedalcoholracemization and enantioselective Cu‐H‐catalyzed dehydrogenative Si‐O coupling of alcohols and hydrosilanes. The catalytic processes are orthogonal, and the racemization catalyst does not promote any background reactions such as the racemization
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
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