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.
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