C1-symmetric bisphosphine ligands and their use in the asymmetric synthesis of pregabalin
申请人:Bao Jian
公开号:US20050228190A1
公开(公告)日:2005-10-13
Materials and methods for preparing (S)-(+)-3-(aminomethyl)-5-methyl-hexanoic acid and structurally related compounds via enantioselective hydrogenation of prochiral olefins are disclosed. The methods employ novel chiral catalysts, which include C
1
-symmetric bisphosphine ligands bound to transition metals.
[EN] PROCESS FOR PREPARING CATIONIC RHODIUM COMPLEXES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE COMPLEXES CATIONIQUES DU RHODIUM
申请人:JOHNSON MATTHEY PLC
公开号:WO2010001173A1
公开(公告)日:2010-01-07
A process is described for the synthesis of a cationic [rhodium diolefin phosphorus ligand] complex comprising the steps of: (a) reacting a rhodium-diolefin-1,3-diketonate and an acid in a ketone solvent, (b) adding a stabilising olefin to form a stabilised cationic rhodium compound, and (c) mixing a phosphorus ligand with the solution of the stabilised cationic rhodium compound to form a solution of the cationic [rhodium diolefin phosphorus ligand] complex. The solution may be used directly or the complex recovered. In one embodiment, the solution may be combined with a co-solvent and the ketone removed to give a new catalyst solution, from which the complex may be recovered.
Cobalt-catalysed asymmetric hydrovinylation of 1,3-dienes
作者:Yam N. Timsina、Rakesh K. Sharma、T. V. RajanBabu
DOI:10.1039/c5sc00929d
日期:——
of bidentate 1,n-bis-diphenylphosphinoalkane-CoCl2 complexes Cl2Co[P~P]} and Me3Al or methylaluminoxane, acyclic (E)-1,3-dienes react with ethylene (1 atmosphere) to give excellent yields of hydrovinylation products. The regioselectivity (1,4- or...
Preparation of Optically Pure Beta-Amino Acids Having Affinity for the Alpha-Delta Protein
申请人:Herrinton Paul Matthew
公开号:US20080194841A1
公开(公告)日:2008-08-14
Disclosed are materials and methods for preparing optically active β-amino acids, which bind to the alpha-2-delta subunit of a calcium channel and are useful for treating pain, fibromyalgia, and a variety of psychiatric and sleep disorders. The method includes reacting a chiral allyl amine with a 2-alkynoate in the presence of a Lewis acid and a base to give a chiral tertiary enamine, which after reaction with ammonia, is hydrogenated to give optically active β-amino acids.
PREPARATION OF BETA-AMINO ACIDS HAVING AFFINITY FOR THE ALPHA-2-DELTA PROTEIN
申请人:Conway Brian G
公开号:US20090247743A1
公开(公告)日:2009-10-01
Disclosed are materials and methods for preparing optically active β-amino acids of Formula 1,
which bind to the alpha-2-delta (α2δ) subunit of a calcium channel.