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.
asymmetric hydrogenation of 13 different β-dehydroaminoacid derivatives to give optically active β-amino acidesters has been examined. Readily accessible monodentate octahydrobinaphthol-based phosphoramidites were used as chiral ligands. Good to excellent enantioselectivities and yields were obtained for the E isomers, whereas poorer catalyst performance was found for the Z isomers. Importantly, to obtain
C1-SYMMETRIC BISPHOSPHINE LIGANDS AND THEIR USE IN THE ASYMMETRIC SYNTHESIS OF PREGABALIN
申请人:Warner-Lambert Company LLC
公开号:EP1727620A1
公开(公告)日:2006-12-06
C1-Symmetric Bisphospine Ligands and Their Use in the Asymmetric Synthesis of Pregabalin
申请人:Bao Jian
公开号:US20090124820A1
公开(公告)日:2009-05-14
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.