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首页> 外文期刊>RSC Advances >Organocatalysis in polysiloxane gels: a magnetic-stir-bar encapsulated catalyst system prepared by thiol-ene photo-click immobilization
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Organocatalysis in polysiloxane gels: a magnetic-stir-bar encapsulated catalyst system prepared by thiol-ene photo-click immobilization

机译：聚硅氧烷凝胶中的有机催化：通过硫醇-烯光点击固定化制备的磁力搅拌棒封装的催化剂体系

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摘要

This manuscript presents a facile thiol-ene photo-click chemistry method to prepare magnetic stir bar-encapsulated polysiloxane-based organocatalyst gels under benign conditions, and develops a Stir Bar-Encapsulated Catalysis (SBEC) technique. Through thiol-ene addition chemistry, we graft olefin-terminated organocatalysts (i.e. MacMillan catalyst, proline catalyst, and N-heterocyclic carbene catalyst) onto poly[3-mercaptopropylmethylsiloxane], which is further photo-crosslinked to coat the embedded magnetic stir bar. The prepared magnetic stir bar-encapsulated polysiloxane-based organocatalyst gels can be put into reaction flasks to perform stirring and catalysis functions at the same time. The most important benefit of SBEC technique is to infinitely simplify the catalyst/product separation procedure by using a simple stir-bar-retriever, even without any precipitation/filtration steps. The catalytic performances of three different organocatalyst gels applied in asymmetric Diels-Alder reaction, asymmetric aldol reaction and benzoin condensation reaction respectively are also examined herein.
机译：该手稿提出了一种简便的硫醇-烯光点击化学方法，以在良性条件下制备磁性搅拌棒封装的聚硅氧烷基有机催化剂凝胶，并开发了搅拌棒封装的催化（SBEC）技术。通过硫醇-烯加成化学，我们将烯烃封端的有机催化剂（即MacMillan催化剂，脯氨酸催化剂和N-杂环卡宾催化剂）接枝到聚[3-巯基丙基甲基硅氧烷]上，然后进一步光交联以涂覆嵌入式磁力搅拌棒。可以将制备的磁力搅拌棒封装的聚硅氧烷基有机催化剂凝胶放入反应瓶中，以同时执行搅拌和催化功能。 SBEC技术的最重要的好处是，即使没有任何沉淀/过滤步骤，也可以通过使用简单的搅拌棒式检索器来无限简化催化剂/产物分离程序。本文还分别考察了三种不同的有机催化剂凝胶分别在不对称Diels-Alder反应，不对称醛醇反应和苯偶姻缩合反应中的催化性能。

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