[EN] TRIAZOLE CARBAMATE PYRIDYL SULFONAMIDES AS LPA RECEPTOR ANTAGONISTS AND USES THEREOF [FR] PYRIDYLSULFONAMIDES DE CARBAMATE DE TRIAZOLE UTILISÉES EN TANT QU'ANTAGONISTES DU RÉCEPTEUR DE LPA ET LEURS UTILISATIONS
Efficient asymmetric synthesis of aryl difluoromethyl sulfoxides and their use to access enantiopure α-difluoromethyl alcohols
作者:Chloé Batisse、Maria F. Céspedes Dávila、Marco Castello、Amélia Messara、Bertrand Vivet、Gilbert Marciniak、Armen Panossian、Gilles Hanquet、Frédéric R. Leroux
DOI:10.1016/j.tet.2019.04.037
日期:2019.6
scarcely described yet. We recently developed a new strategy, based on the use of an enantiopure difluoromethyl sulfoxide used as chiral and traceless auxiliary, for the synthesis of highly enantioenriched α-difluoromethyl alcohols. The first method developed in our laboratory aims to access highly stereoenriched α,α-difluoro-β-hydroxysulfoxides through the condensation of the enantiopure difluoromethyl
Steric vs. electronic effects in the Lactobacillus brevis ADH-catalyzed bioreduction of ketones
作者:Cristina Rodríguez、Wioleta Borzęcka、Johann H. Sattler、Wolfgang Kroutil、Iván Lavandera、Vicente Gotor
DOI:10.1039/c3ob42057d
日期:——
(LBADH) is an alcohol dehydrogenase that is commonly employed to reduce alkyl or aryl ketones usually bearing a methyl, an ethyl or a chloromethyl as a small ketone substituent to the corresponding (R)-alcohols. Herein we have tested a series of 24 acetophenone derivatives differing in their size and electronic properties for their reduction employing LBADH. After plotting the relative activity against
The effects of both steric and electronic properties of ketones on the selectivity in asymmetric transfer hydrogenation have been studied with aryl alkyl/fluoroalkyl ketones using four ruthenium based catalysts and two different media. The 1-arylethanones, 1-aryl-2-fluoroethanones and 2,2-difluoroacetophenones could be reduced with medium to high ee (86–99%), while the 1-aryl-2,2,2-trifluoroethanones
Molecular Basis for the High Activity and Enantioselectivity of the Carbonyl Reductase from <i>Sporobolomyces salmonicolor</i> toward α-Haloacetophenones
2-Trifluoro-1-phenylethanol was prepared in excellent isolated yield and enantiomeric excess from the reduction of α,α,α-trifluoroacetophenone with mutant T209A. These results suggest that tuning the interactions between the halogen atoms/phenyl group of the substrate and the aminoacid residues of the enzyme would lead to valuable mutants for the practical synthesis of β-haloalcohols.
The synthesis of chiral amines is of central importance to pharmaceutical chemistry, and the inclusion of fluorine atoms in drug molecules can both increase potency and slow metabolism. Optically enriched β‐fluoroamines can be obtained by the kinetic resolution of racemic amines using amine transaminases (ATAs), but yields are limited to 50 %, and also secondary amines are not accessible. In order