Lipase-catalyzed kinetic resolution of (RS)-hydroxy tellurides
摘要:
The enzymatic resolution of racemic mixtures of hydroxy tellurides with a range of lipases has been investigated. Lipase-B from Candida antarctica (CALB) gave the best conversions, providing both enantiomers with high enantiomeric purity. A comparative study of the effect of solvent and substrate on the enzymatic kinetic resolution was performed. (c) 2006 Elsevier Ltd. All rights reserved.
Lipase-catalyzed kinetic resolution of (RS)-hydroxy tellurides
摘要:
The enzymatic resolution of racemic mixtures of hydroxy tellurides with a range of lipases has been investigated. Lipase-B from Candida antarctica (CALB) gave the best conversions, providing both enantiomers with high enantiomeric purity. A comparative study of the effect of solvent and substrate on the enzymatic kinetic resolution was performed. (c) 2006 Elsevier Ltd. All rights reserved.
The thiol peroxidase-like activity of a series of novel functionalized tellurium containing catalysts has been investigated with different models. Dialkyl- and aryl-alkyl-tellurides, conveniently achieved through the ring opening of strained heterocycles, exhibited remarkable catalytic antioxidant activity, being able to reduce hydrogen peroxide in the presence of different thiols (benzenethiol, dithiothreitol
Differently substituted β-hydroxy- and β-amino dialkyl and alkyl-aryl tellurides and selenides have been prepared through ring-opening reactions of epoxides and aziridines with selenium- or tellurium-centered nucleophiles. The antioxidant properties and the cytotoxicity of such compounds have been investigated on normal human dermal fibroblasts. Most of the studied compounds exhibited a low cytotoxicity
NMR chiral discrimination of chalcogen containing secondary alcohols
作者:Naiade B.G. Marques、Raquel G. Jacob、Gelson Perin、Eder J. Lenardão、Diego Alves、Márcio S. Silva
DOI:10.1002/chir.23030
日期:2019.1
stable, nonhygroscopic, and readily available chiral derivatizing agent (CDA) for NMRchiral discrimination of chalcogen containing secondary alcohols. The chiralrecognition by CDA and chiralsolvatingagent (CSA) was assessed using 1H, 77Se‐1H}, and 125Te‐1H} NMRspectroscopy. A simple model for the assignment of the absolute configuration from NMR data is presented.