Rhodium-Catalyzed Asymmetric Addition of Arylboronic Acids to Glyoxylates: Access to Optically Active Substituted Mandelic Acid Esters
作者:Diao Chen、Jian-Guo Liu、Xu Zhang、Ming-Hua Xu
DOI:10.1055/s-0037-1610722
日期:2019.9
A rhodium-catalyzed enantioselective addition of glyoxylates to arylboronic acids promoted by a simple chiral sulfinamide-based olefin ligand under mild reaction conditions is described. The reaction provides access to a variety of opticallyactive substituted mandelic acid esters in good yields with up to 83% ee. The catalytic system is also applicable to pyruvate addition. The synthetic utility of
METHOD FOR PRODUCTION OF OPTICALLY ACTIVE -HYDROXYCARBOXYLIC ACID
申请人:Daiichi Fine Chemical Co., Ltd.
公开号:EP1930441A1
公开(公告)日:2008-06-11
An efficient method for producing an optically active α -hydroxycarboxylic acid represented by the following general formula (I) [A represents a residue of a 5- or 6-membered cyclic compound, * indicates a carbon atom in the S- or R-configuration, X represents hydrogen atom or an alkyl group having 1 to 4 carbon atoms], which comprises the step of treating a corresponding ester compound (not optically pure) with cell bodies or a culture, or a processed product or an extract thereof of a microorganism of the genus Leifsonia, genus Cylindrocarpon, genus Verticillium, or the like.
Method for Producing Optically Active Alpha-Hydroxycarboxylic Acid
申请人:Sakamoto Keiji
公开号:US20080311636A1
公开(公告)日:2008-12-18
An efficient method for producing an optically active α-hydroxycarboxylic acid represented by the following general formula (I) [A represents a residue of a 5- or 6-membered cyclic compound, * indicates a carbon atom in the S- or R-configuration, X represents hydrogen atom or an alkyl group having 1 to 4 carbon atoms], which comprises the step of treating a corresponding ester compound (not optically pure) with cell bodies or a culture, or a processed product or an extract thereof of a microorganism of the genus
Leifsonia
, genus
Cylindrocarpon
, genus
Verticillium
, or the like.
Enantio- and chemoselective Brønsted-acid/Mg(<sup>n</sup>Bu)<sub>2</sub> catalysed reduction of α-keto esters with catecholborane
作者:Dieter Enders、Bianca A. Stöckel、Andreas Rembiak
DOI:10.1039/c4cc00427b
日期:——
The first enantio- and chemoselective Bronsted-acid catalysed reduction of alpha-keto esters with catecholborane has been developed. The alpha-hydroxy esters were obtained under mild reaction conditions in virtually quantitative yields and excellent enantioselectivities. With slight modifications both enantiomers can be obtained without any loss of selectivity.
Simply air: Vanadium-catalyzed oxidative kinetic resolution of methyl o-chloromandelate by ambient air
作者:Lu Yin、Xian Jia、Xing Shu Li、Albert S.C. Chan
DOI:10.1016/j.cclet.2010.03.002
日期:2010.7
Vanadium-catalyzed oxidativekineticresolution (OKR) of methyl o-chloromandelate 2a, key intermediate of the well-known oral antiplatelet agent (S)-clopidogrel, was achieved by ambientair for the first time. The airoxidation system, which was composed of vanadium and tridentate Schiff base ligands derived from amino alcohols and salicylaldehyde derivatives, afforded an efficient and economic approach