Integration of on‐column catalysis and EKC analysis: Investigation of enantioselective sulfoxidations

Integration of on‐column catalysis and EKC analysis: Investigation of enantioselective sulfoxidations
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柱上催化与 EKC 分析的整合:对映选择性磺化氧化的研究

DOI:
10.1002/elps.201100527
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发表时间:
2012
期刊:
影响因子:
2.9
通讯作者:
O. Trapp
O. Trapp
中科院分区:
生物学3区
文献类型:
--
作者:
S. Fuessl;O. Trapp

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提出了一种研究催化反应的新技术,通过将涂覆有固定化催化剂的熔融石英毛细管与裸露的熔融石英毛细管耦合来实现反应产物的分离并产生电渗流,电渗流驱动反应物和产物通过催化活性毛细管的运输。该技术的原理通过在钒(IV)-salen催化剂的存在下用过氧化氢将苄基苯硫醚对映选择性磺基氧化成相应的亚砜来说明,所述钒(IV)-salen催化剂固定于非极性聚硅氧烷并永久地键合到反应毛细管的内表面。反应产物的对映体比率通过电动色谱法同时测定,使用150 mg/mL硫酸化β-环糊精作为手性添加剂,在pH 8.3的10 mM磷酸二氢钠背景电解质中。与使用钒(IV)-salen催化剂的苄基苯硫醚的常规对映选择性磺氧化反应相比,该反应的收率高达11%,通过该方法实现了高达23%的收率。此外,所提出的技术提供了更多的优点,例如使用非极性聚硅氧烷相作为溶剂来改善底物选择性,对底物库进行高通量动力学测量的可行性,快速筛选和研究立体不稳定化合物,即手性亚砜,以及仅使用微量试剂来筛选反应。
A novel technique is presented to investigate catalytic reactions by coupling a fused‐silica capillary coated with an immobilized catalyst and a bare fused‐silica capillary to achieve separation of the reaction products and to generate an electroosmotic flow, which drives the transport of the reactants and products through the catalytically active capillary. The principle of this technique is illustrated by the enantioselective sulfoxidation of benzylphenylsulfide with hydrogen peroxide to the corresponding sulfoxide in the presence of a vanadium(IV)‐salen catalyst, which is immobilized to nonpolar polysiloxane and permanently bonded to the inner surface of the reaction capillary. The enantiomeric ratio of the reaction product is simultaneously determined by electrokinetic chromatography using 150 mg/mL sulfated β‐cyclodextrin as chiral additive in 10 mM sodium dihydrogenphosphate background electrolyte at pH 8.3. In contrast to conventional enantioselective sulfoxidations of benzylphenylsulfide using the vanadium(IV)‐salen catalyst, which giveees of up to 11%, aneeof up to 23% was achieved by this approach. Furthermore, the presented technique offers many more advantages, such as improved substrate selectivity using the nonpolar polysiloxane phase as a solvent, the feasibility to perform high‐throughput kinetic measurements of substrate libraries, rapid screening and investigation of stereolabile compounds, that is, chiral sulfoxides, and screening of reactions using only minute amounts of reagents.
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