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Catalysis with N-heterocyclic carbenes under oxidative conditions

机译:N-杂环卡宾在氧化条件下的催化作用

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This Concept article discusses the potential of oxidative carbene catalysis in synthesis and comprehensively covers pioneering studies as well as recent developments. Oxidative carbene catalysis can be conducted by using inorganic and organic oxidants. Applications in cascade processes, in enantioselective catalysis, and also in natural product synthesis are discussed. Cascading down: Reaction of an aldehyde with an NHC provides the corresponding Breslow intermediate A, which can be readily oxidized with various organic and inorganic oxidants to give the acylazolium ion B (see scheme). Intermediate B can react with various nucleophiles either at the 2 or 4-position. With enals as starting aldehydes, elegant cascade processes have been developed using oxidative carbene catalysis.
机译:该概念文章讨论了氧化卡宾催化在合成中的潜力,并全面涵盖了开创性研究和最新进展。氧化卡宾催化可以通过使用无机和有机氧化剂来进行。讨论了在级联过程,对映选择性催化以及天然产物合成中的应用。降级:醛与NHC的反​​应提供了相应的Breslow中间体A,可以轻松地用各种有机和无机氧化剂将其氧化,以生成酰基lium离子B(请参见方案)。中间体B可以在2或4位与各种亲核试剂反应。以烯醛作为起始醛,已经使用氧化卡宾催化技术开发出了优雅的级联方法。

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