[EN] PREPARATION OF ESOMEPRAZOLE AND ITS PHARMACEUTICALLY ACCEPTABLE SALTS [FR] PRÉPARATION D'ÉSOMÉPRAZOLE ET DE SES SELS PHARMACEUTIQUEMENT ACCEPTABLES
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
Catalytic Asymmetric Oxidation of Heteroaromatic Sulfides with tert-Butyl Hydroperoxide Catalyzed by a Titanium Complex with a New Chiral 1,2-Diphenylethane-1,2-diol Ligand
作者:Biao Jiang、Xiao-Long Zhao、Jia-Jia Dong、Wan-Jun Wang
DOI:10.1002/ejoc.200801139
日期:2009.3
Heteroaromatic sulfoxides, especially 1H-benzimidazolyl pyridinylmethyl sulfoxides, usually used as the blockbuster gastric proton pump inhibitors (PPIs), have been prepared highly enantioselectivily by catalyticasymmetricoxidation of sulfides attached to nitrogen-containing heterocyles with tert-butyl hydroperoxide in the presence of a chiral titanium complex, formed in situ from Ti(iPrO)(4), chiral 1,2-diphenylethane-1
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
[EN] A NOVEL STEREOSELECTIVE SYNTHESIS OF BENZIMIDAZOLE SULFOXIDES<br/>[FR] NOUVEAU PROCEDE DE SYNTHESE STEREOSELECTIVE DE SULFOXYDES DE BENZIMIDAZOLE
申请人:HETERO DRUGS LTD
公开号:WO2005116011A1
公开(公告)日:2005-12-08
The present invention relates to a process for stereoselective synthesis of substituted sulfoxides either as a single enantiomer or in an enantiomerically enriched form. Thus, 5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]thio]-1H-benzimidazole is reacted with (R)-camphorsulfonyl chloride to form a mixture of 1-(R)-camphorsulfonyl-5-(and 6-)methoxy-2-[(3,5-dimethyl-4-methoxy-2-pyridyl)methylthio]-1H-benzimidazole, oxidized to obtain a diastereomeric excess of 1-(R)-camphorsulfonyl-(5- and 6-)-methoxy-2-[(3,5-dimethyl-4-methoxy-2-pyridyl)methyl-(S)-sulfinyl]-1H-benzimidazole over 1-(R)-camphorsulfonyl-(5- and 6-)-methoxy-2-[(3,5-dimethyl-4-methoxy-2-pyridyl)methyl-(R)-sulfinyl]-1H-benzimidazole, the diastereomers are separated by fractional crystallization and the separated 1-(R)-camphorsulfonyl-(5- and 6-)-methoxy-2-[(3,5-dimethyl-4-methoxy-2-pyridyl)methyl-(S)-sulfinyl]-1H-benzimidazole is deprotected to give esomeprazole.