Brønsted Acid Catalyzed Asymmetric Reduction of Ketones and Acyl Silanes Using Chiral <i>anti</i>-Pentane-2,4-diol
作者:Jun-ichi Matsuo、Yu Hattori、Hiroyuki Ishibashi
DOI:10.1021/ol1006532
日期:2010.5.21
Ketones and acyl silanes were reduced to the corresponding alcohols by a simple procedure employing anti-1,3-diol and a catalytic amount (5 mol %) of 2,4-dinitrobenzenesulfonic acid in benzene at reflux. Asymmetric induction reached up to >99% ee when a chiral pentane-2,4-diol of 97% ee was used.
<i>Escherichia coli</i>/ADH-A: An All-Inclusive Catalyst for the Selective Biooxidation and Deracemisation of Secondary Alcohols
作者:Caroline E. Paul、Iván Lavandera、Vicente Gotor-Fernández、Wolfgang Kroutil、Vicente Gotor
DOI:10.1002/cctc.201300409
日期:2013.12
the synthesis of the highly valuable raspberry ketone. Moreover, a biocatalytic concurrent process was developed with the resting cells of E. coli/ADH‐A, ADH from Lactobacillus brevis, and glucose dehydrogenase for the deracemisation of various secondary alcohols, which afforded the desired enantiopure alcohols in more than 99 % ee starting from the racemic mixture. The reaction time of deracemisation
Asymmetric reduction of aliphatic ketones and acyl silanes using chiral anti-pentane-2,4-diol and a catalytic amount of 2,4-dinitrobenzenesulfonic acid
Aliphatic ketones were reduced to the corresponding secondaryalcohols by using anti-1,3-diol and a catalytic amount of 2,4-dinitrobenzenesulfonic acid (DNBSA) in benzene at reflux. Addition of 1-octanethiol in that media improved the efficiency of the reduction. Asymmetric reduction of aliphatic ketones was performed by using chiral anti-pentane-2,4-diol, and highly asymmetric induction (up to >99%
A new, highly regio- and stereo-selective synthesis of cyclic iodocarbonates of allylic and homoallylicalcohols involving cyclofunctionalization of the corresponding alcohol carbonates is described.
Synthesis and 13C NMR Spectroscopy of Model Compounds for the Microstructure Analysis of Poly(Vinyl Glycoside)s
作者:Jialong Yuan、Holger Frauenrath
DOI:10.1002/ejoc.200800798
日期:——
derivatives was synthesized in order to serve as model compounds for the analysis of the stereochemistry, regiochemistry, and defect structures of poly(vinyl glycoside)s. 13C NMR spectroscopic analysis of these compounds revealed that the attached chiral carbohydrate substituents induced a strong correlation of the chemicalshifts of both the anomeric C and the α-C atom of the aglycon with the absolute configuration