Chiral Imidazo[1,5-<i>a</i>]pyridine–Oxazolines: A Versatile Family of NHC Ligands for the Highly Enantioselective Hydrosilylation of Ketones
作者:Chinna Ayya Swamy P、Andrii Varenikov、Graham de Ruiter
DOI:10.1021/acs.organomet.9b00526
日期:2020.1.27
report the synthesis and application of a versatile class of N-heterocyclic carbene ligands based on an imidazo[1,5-a]pyridine-3-ylidine backbone that is fused to a chiral oxazoline auxiliary. The key step in the synthesis of these ligands involves the installation of the oxazoline functionality via a microwave-assisted condensation of a cyano-azolium salt with a wide variety of 2-amino alcohols. The
Preparation and Characterization of Chiral Oxazaborolidine Complex Immobilized SBA-15 and Its Application in the Asymmetric Reduction of Prochiral Ketones
作者:Umesh Balakrishnan、Nallamuthu Ananthi、Sakthivel Tamil Selvan、Ravindra Pal、Katsuhiko Ariga、Sivan Velmathi、Ajayan Vinu
DOI:10.1002/asia.200900412
日期:2010.4.1
aromatic prochiral ketones. The activity of the chiral oxazaborolidine complex immobilized SBA‐15 catalysts is also compared with that of the pure chiral oxazaborolidine complex, which is a homogeneous catalyst. It is found that the activity of the chiral complex immobilized SBA‐15 heterogeneous catalyst is comparable with that of the homogeneous catalyst.
Novel Ruthenium Complexes Having Hybrid Amine Ligands, Their Preparation And Use
申请人:Sandoval Christian A.
公开号:US20110092712A1
公开(公告)日:2011-04-21
The invention relates to a novel class of ruthenium complexes containing phosphine and hybrid amine ligands, their preparation and use as catalysts in the reduction of simple ketones to alcohols by molecular hydrogenation. The reactivity and enantioselectivity of such complexes in the asymmetric hydrogenation of simple ketones could be enchanced by the addition of some selective additives.
[EN] CATALYST AND PROCESS FOR SYNTHESISING THE SAME<br/>[FR] CATALYSEUR ET SON PROCÉDÉ DE SYNTHÈSE
申请人:UNIV WARWICK
公开号:WO2014068331A1
公开(公告)日:2014-05-08
The invention relates to a method for synthesising tethered ruthenium catalysts and novel tethered ruthenium catalysts obtainable by this methods. The method involves carrying out an "arene swapping" reaction avoiding the requirement to use complicated techniques making use of unreliable Birch reductions and unstable cyclodienyl intermediates.
ASYMMETRIC HYDROGENATION METHOD FOR KETONE COMPOUND
申请人:Zhang Wanbin
公开号:US20130053574A1
公开(公告)日:2013-02-28
The invention relates to an asymmetric hydrogenation method for ketone compounds, comprising the step of: under hydrogen atmosphere, in the presence of an in situ catalyst derived from a chiral ligand and a ruthenium salt, adding a ketone compound and a base into a second solvent to carry out an asymmetric hydrogenation for the ketone compound. The invention can obtain a conversion of 100% and a highest asymmetric inducement effect of 99.7% for the ketone compound. The invention has the advantages including simple procedure, high conversion and selectivity, good atom economy and good prospect of industrial application.