2,2‘,5,5‘-Tetramethyl-4,4‘-bis(diphenylphoshino)-3,3‘-bithiophene: A New, Very Efficient, Easily Accessible, Chiral Biheteroaromatic Ligand for Homogeneous Stereoselective Catalysis
C2-symmetry chelating ligand for transitionmetals, is described, starting from 2,5-dimethylthiophene. The complexes of this electron-rich diphosphine with Ru(II) and Rh(I) were used as catalysts in some homogeneous hydrogenation reactions of prostereogenic carbonyl functions of alpha- and beta-ketoesters, of prostereogenic carbon-carbon double bonds of substituted acrylic acids, and of N-acetylenamino
Ketoreductase Polypeptides for the Production of Azetidinone
申请人:Campopiano Onorato
公开号:US20090162909A1
公开(公告)日:2009-06-25
The present disclosure provides engineered ketoreductase enzymes having improved properties as compared to a naturally occurring wild-type ketoreductase enzyme. Also provided are polynucleotides encoding the engineered ketoreductase enzymes, host cells capable of expressing the engineered ketoreductase enzymes, and methods of using the engineered ketoreductase enzymes to synthesize a variety of chiral compounds.
METHOD FOR PRODUCING OPTICALLY ACTIVE 2-(N-SUBSTITUTED AMINOMETHYL)-3-HYDROXYBUTYRIC ACID ESTER
申请人:Yasohara Yoshihiko
公开号:US20090104671A1
公开(公告)日:2009-04-23
The present invention relates to a method for producing optically active 2-(N-substituted aminomethyl)-3-hydroxybutyric acid esters wherein a 2-(N-substituted aminomethyl)-3-oxobutyric acid ester is treated with an enzyme source capable of stereoselectively reducing said ester to the corresponding optically active 2-(N-substituted aminomethyl)-3-hydroxybutyric acid ester having the (2S,3R) configuration. The present invention provides an efficient method for industrially producing optically active 2-(N-substituted aminomethyl)-3-hydroxybutyric acid esters, in particular such compounds having the (2S,3R) configuration, which are useful as intermediates for the production of medicinal compounds, among others.
NEW TRINEM ANTIBIOTICS AND INHIBITORS OF BETA-LACTAMASES
申请人:Plantan Ivan
公开号:US20110166118A1
公开(公告)日:2011-07-07
The present invention relates to a compound of Formula (I) in particular compounds of formula (Ia), the use of a therapeutically effective amount of one or more compounds of formula (I) or (Ia) as a broad-spectrum antibiotic and the use of a pharmaceutical composition comprising said compounds for the treatment of bacterial infections in humans or animals.