The Ru-catalyzed enantioselective preparation of chiral halohydrins and their application in the synthesis of (R)-clorprenaline and (S)-sotalol
摘要:
The asymmetric transfer hydrogenation of a series of halo-substituted aryl methyl ketones, including those substituted in both alpha-methyl and aryl rings, was studied for the preparation of chiral halohydrins. Up to 99.7% ee was obtained with 2-chloro-1-(2-chlorophenyl)ethanone as the substrate and Ru-CsDPEN as the catalyst in an HCOONa/H2O system. (R)-Clorprenaline, a drug used in the treatment of respiratory disorders, such as bronchitis and asthma, and (S)-sotalol, a class-III antiarrhythmic compound, were prepared with these chiral halohydrins. (C) 2011 Elsevier Ltd. All rights reserved.
Three kinds of sulfated β‐cyclodextrin (S‐β‐CD), including a single isomer, heptakis‐6‐sulfato‐β‐cyclodextrin (HS‐β‐CD), degree of substitution (DS) of 7, which was synthesized in our laboratory and another two commercialized randomly substituted mixtures, a sulfated β‐cyclodextrin with DS of 7 to 11, as well as a highly sulfated‐β‐cyclodextrin with DS of 12 to 15, were used for the enantioresolution
anti-Prelog microbial reduction of aryl α-halomethyl or α-hydroxymethyl ketones with Geotrichum sp. 38
作者:Zhi-Liang Wei、Zu-Yi Li、Guo-Qiang Lin
DOI:10.1016/s0040-4020(98)00796-0
日期:1998.10
Reduction of aryl α-halomethyl ketones 5a-d and 7a-h and α-hydroxymethyl ketones 10a-b by Geotrichum sp. 38 affording mostly the anti-Prelog alcohols was reported and the stereoselectivities of the reductiveproducts were discussed.
Characteristic and complementary chiral recognition ability of four recently developed immobilized chiral stationary phases based on amylose and cellulose phenyl carbamates and benzoates
various immobilizedchiralstationaryphases (CSPs) have been developed. The immobilized CSPs have opened up possibilities not only maintaining the high chiral recognition abilities as well as corresponding coated ones but also affording high durability to various mobile phase. This report directed to investigate enantioseparation of recently launched four immobilized CSPs with cellulose and amylose
Preparation of a novel hydroxypropyl‐γ‐cyclodextrin functionalized monolith for separation of chiral drugs in capillary electrochromatography
作者:Miaoduo Deng、Mengyao Xue、Yanru Liu、Min Zhao
DOI:10.1002/chir.23300
日期:2021.5
In this study, a novelhydroxypropyl‐γ‐cyclodextrin (HP‐γ‐CD) functionalized monolithic capillary column was prepared by one‐pot sequential strategy and used for chiralseparation in capillaryelectrochromatography for the first time. In one pot, GMA‐HP‐γ‐CD as functional monomer was allowed to be formed via the ring opening reaction between HP‐γ‐CD and glycidyl methacrylate (GMA) catalyzed by 1,8‐diazabicyclo[5