Structural dependence on the property of chiral stationary phases derived from chitosan bis(arylcarbamate)-(amide)s
作者:Zi-Wei Feng、Guo-Song Qiu、Xiao-Meng Mei、Shuang Liang、Fei Yang、Shao-Hua Huang、Wei Chen、Zheng-Wu Bai
DOI:10.1016/j.carbpol.2017.03.052
日期:2017.7
structural dependence of chitosan derivatives on enantioseparation and mobile phase tolerance of the corresponding chiral packing materials for liquid chromatography. Hence, a series of chitosan bis(arylcarbamate)-(n-pentyl amide)s and the related chiral stationary phases (CSPs) were prepared from chitosans with different molecular weights. Because of the H-bond formed via CH3-π interaction, the CSP bearing
Eluent Tolerance and Enantioseparation Recovery of Chiral Packing Materials Based on Chitosan Bis(Phenylcarbamate)-(n-Octyl Urea)s for High Performance Liquid Chromatography
作者:Jing Wang、Shao-Hua Huang、Wei Chen、Zheng-Wu Bai
DOI:10.3390/molecules21111528
日期:——
capacity of the chitosan bis(phenylcarbamate)-(n-octyl urea)s in ethyl acetate, acetone and tetrahydrofuran (THF) was evaluated. Among the chitosan derivatives, the chitosan bis(3,5-dichlorophenylcarbamate)-(n-octyl urea) polymer showed the highest swelling capacity in ethyl acetate and THF. The polymer-based CSPs could be utilized with pure ethyl acetate and a normal phase containing 70% THF, but was
Inhibitors of the gastric H+, K+-atpase with enhanced therapeutic properties
申请人:Gant G. Thomas
公开号:US20070082929A1
公开(公告)日:2007-04-12
Chemical syntheses and medical uses of novel inhibitors of the gastric H
+
, K
+
-ATPase for the treatment and/or management of duodenal ulcers, heartburn, acid reflux, other conditions mediated by gastric acid secretion and/or psoriasis are described.
[EN] IMPROVED PREPARING METHOD OF (S)-OMEPRAZOLE FROM OMEPRAZOLE RACEMATE USING OPTICAL RESOLUTION AGENT<br/>[FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE (S)-OMÉPRAZOLE À PARTIR D'UN RACÉMATE D'OMÉPRAZOLE À L'AIDE D'UN AGENT DE RÉSOLUTION OPTIQUE
申请人:SK CHEMICALS CO LTD
公开号:WO2009145368A1
公开(公告)日:2009-12-03
The present invention relates to an improved preparing method of (S)-omeprazole from omeprazole racemate. In an exemplary embodiment, the preparing method according to the present invention comprises the steps of: a) reacting omeprazole racemate with optically active diethyl-D-tartrate and a titanium compound in an alcohol solvent to prepare an omeprazole racemic complex; b) reacting the omeprazole racemic complex with 1.5-3.0 molar equivalents of (S)-(+)-mandelic acid as optical resolution agent to prepare an optically active (S)-omeprazole complex; and c) dissociating the optically active (S)-omeprazole complex with a basic solution to prepare an (S)-omeprazole free base or reacting the (S)- omeprazole free base with a metal salt to transfer to a metal salt or a metal salt hydrate of (S)- omeprazole. With optical purity of 99.0 %ee or better, the (S)-omeprazole, the metal salt thereof or the hydrate thereof prepared in accordance with the present invention is useful as a medicinal material.