Iron-catalyzed asymmetric hydrosilylation of ketones
作者:Ziqing Zuo、Lei Zhang、Xuebing Leng、Zheng Huang
DOI:10.1039/c5cc00612k
日期:——
iminopyridine-oxazoline (IPO) ligands have been synthesized. The most sterically hindered iron catalyst exhibits excellent activity (up to 99% yield) and high enantioselectivity (up to 93% ee) in asymmetrichydrosilylation of aryl ketones.
Studies on Rhizopus arrhizus mediated enantioselective reduction of arylalkanones
作者:Neeta A Salvi、Subrata Chattopadhyay
DOI:10.1016/s0040-4020(01)00134-x
日期:2001.4
The effect of substitution on the biotransformation of various arylalkanones using Rhizopus arrhizus was investigated. The organism was found to be promising for the reduction of phenylalkanones and arylethanones with good to excellent enantioselectivity. The reduction followed Prelog's rule giving the (S)-carbinols in all the cases. The enantioselectivity of the reaction improved with increasing size
Titanium complex of fluorous axially dissymmetric ligand ((Ra∗)-2,2′-bis[(R∗)-perfluoro-1H-1-hydroxyoctyl]biphenyl, ((Ra∗)-(R∗)2-1)) having perfluoroheptyl carbinol moieties catalyzedenantioselectiveaddition of a methyl group to aldehydes. Dimethylzinc prepared in situ by mixing ZnCl2 and methyl magnesium bromide without removal of magnesium salt was more reactive for addition of methyl group than
Activity and specificity studies of the new thermostable esterase EstDZ2
作者:Kamela Myrtollari、Nikolaos Katsoulakis、Dimitra Zarafeta、Ioannis V. Pavlidis、Georgios Skretas、Ioulia Smonou
DOI:10.1016/j.bioorg.2020.104214
日期:2020.11
In this paper, we study the activity and specificity of EstDZ2, a new thermostable carboxyl esterase of unknown function, which was isolated from a metagenome library from a Russian hot spring. The biocatalytic reaction employing EstDZ2 proved to be an efficient method for the hydrolysis of aryl p-, o- or m-substituted esters of butyric acid and esters of secondary alcohols. Docking studies revealed
Because most pharmacologically active receptors are inherently asymmetric, the introduction of asymmetry into molecules that can bind to such receptors is a central topic in modern organic and bioorganic chemistry. We developed a metal charge-directed stereoinduction process in the asymmetrictransferhydrogenation of ketones catalyzed by first-row transition-metal (iron, cobalt, and nickel) amido