Stereoselectivite dans l'hydrogenation de cetoesters et d'un aminoester conjugue, catalysee par des complexes du ruthenium
Stereoselectivite dans l'hydrogenation de cetoesters et d'unaminoester conjugue, catalysee par des complexes du ruthenium
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.
Process for preparing optically active 3-hydroxybutanoic acid
申请人:Takasago International Corporation
公开号:US04981992A1
公开(公告)日:1991-01-01
A process for preparing an optically active 3-hydroxybutanoic acid represented by formula (I): ##STR1## wherein: R.sup.1 represents a protective group of carboxylic acid, and R.sup.2 represents a hydrogen atom; a lower alkyl group which may be substituted with a halogen atom; a lower alkoxy group; a phenyl group which may be substituted with a lower alkyl group or a lower alkoxy group; or a benzyloxy group which may be substituted with a lower alkyl group or a lower alkoxy group, is disclosed, comprising asymmetrically hydrogenating a 3-oxobutanoic acid ester represented by formula (II): ##STR2## wherein R.sup.1 and R.sup.2 are as defined above, in the presence of a ruthenium-optically active phosphine complex as a catalyst. The compound of formula (I) which is useful for synthesizing a 4-acetoxyazetidin-2-one derivative, a useful intermediate for obtaining penem antibiotics, can be prepared economically.
KETOREDUCTASE POLYPEPTIDES FOR THE PRODUCTION OF AZETIDINONE
申请人:Campopiano Onorato
公开号:US20110159567A1
公开(公告)日:2011-06-30
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.
Design and Synthesis of Diphosphine Ligands Based on the Chiral Biindolyl Scaffold and Their Application in Transition-Metal Catalysis
作者:Fuhao Zhang、Gen-Qiang Chen、Xumu Zhang
DOI:10.1021/acs.orglett.3c03068
日期:2024.3.1
easy access to a range of bisphosphine ligands (decagram scale, up to 58% total yield, only three steps). The synthetic method is characterized by an efficient central-to-axial chirality transfer strategy. In particular, the superior performance of the ligands has been demonstrated in diverse reactions, including several asymmetric hydrogenations, asymmetric conjugate reductions, and cycloisomerization