Preparation and Absolute Configurations of Optical Isomers of Sodium 2-((4-(3-Methoxypropoxy)-3-methylpyridin-2-yl)methylsulfinyl)-1H-benzimidazole (E3810).
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
An Electronic Circular Dichroism Study for the Structure–Chiroptical Relationship of Chiral Proton Pump Inhibitors
作者:Zhixu Zhou、Linwei Li、Ning Yan、Lei Du、Changshan Sun、Tiemin Sun
DOI:10.1246/cl.150883
日期:2016.2.5
In this paper, we investigated the electronic circular dichroism (ECD) of proton pump inhibitors (PPIs) using a method of combining experimental spectrum and time-dependent density functional theory (TD-DFT) calculations. In our research, an intriguing helicity-like phenomenon was discovered for the relationship between static dipole moment and ECD curves of different conformers in lansoprazole. The scope and validity of the precious phenomenon have been examined by four PPIs using the same method. Hence, it can be used as a reference to determine and verify the absolute configuration of PPIs-type and PPIs-like chiral sulfoxide.
[EN] PROCESS FOR PREPARING OPTICALLY PURE ACTIVE COMPOUNDS<br/>[FR] PROCEDE DE PREPARATION DE COMPOSES ACTIFS OPTIQUEMENT PURES
申请人:ALTANA PHARMA AG
公开号:WO2004052882A1
公开(公告)日:2004-06-24
The invention relates to a novel process for preparing optically pure PPI having a sulphinyl structure using a chiral zirconium complex or a chiral hafnium complex.
OPTICAL RESOLUTION OF SUBSTITUTED 2-(2-PYRIDINYLMETHYLSULPHINYL)-1H-BENZIMIDAZOLES
申请人:Parthasaradhi Reddy Bandi
公开号:US20120197021A1
公开(公告)日:2012-08-02
The present invention relates to process for preparation of optical resolution of substituted 2-(2-pyridinylmethylsulphinyl)-1H-benzimidazoles either as a single enantiomer or in an enantiomerically enriched form. Thus, for example, R-1,1′-binaphtyl-2-2′-diyl hydrogen phosphate was reacted with 2-[[[3-methyl-4-(2,2,2-trifluoro-ethoxy)-2-pyridinyl]methyl]sulfinyl]-1H-benzimidazole (Lansoprazole) in a mixture of benzene and cyclohexane to obtain diasteremeric complexes. The diasteremeric complexes were subjected to fractional crystallization to obtain R-2-[[[3-methyl-4-(2,2,2-trifluoro-ethoxy)-2-pyridinyl]methyl]sulfinyl]-1H-benzimidazole.R-1,1′-binaphthyl-2-2′-diyl hydrogen phosphate. The separated isomer was treated with sodium bicarbonate in a mixture of ethyl acetate and water to obtain R-2-[[[3-methyl-4-(2,2,2-trifluoro-ethoxy)-2-pyridinyl]methyl]sulfinyl]-1H-benzimidazole (dexlansoprazole).