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Palladium(II)-catalyzed oxidative cyclization of allylic tosylcarbamates: Scope, derivatization, and mechanistic aspects

机译:钯(II)催化烯丙基甲苯磺基氨基甲酸酯的氧化环化:范围,衍生化和机理方面

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摘要

A highly selective oxidative palladium(II)-catalyzed (Wacker-type) cyclization of readily available allylic tosylcarbamates is reported. This operationally simple catalytic reaction furnishes tosyl-protected vinyl-oxazolidinones, common precursors to syn-1,2-amino alcohols, in high yield and excellent diasteroselectivity (>20:1). It is demonstrated that both stoichiometric amounts of benzoquinone (BQ) as well as aerobic reoxidation (molecular oxygen) is suitable for this transformation. The title reaction is shown to proceed through overall trans-amidopalladation of the olefin followed by β-hydride elimination. This process is scalable and the products are suitable for a range of subsequent transformations such as: kinetic resolution (KR) and oxidative Heck-, Wacker-, and metathesis reactions.
机译:据报道,易于获得的烯丙基甲苯磺酰基氨基甲酸酯具有高度选择性的氧化钯(II)催化(Wacker型)环化作用。该操作简单的催化反应以高收率和优异的非对映选择性(> 20:1)提供了甲苯磺酰基保护的乙烯基-恶唑烷酮,它们是syn-1,2-氨基醇的常见前体。已证明,化学计量的苯醌(BQ)以及有氧再氧化(分子氧)均适用于此转化。标题反应显示出通过烯烃的整体反氨基缩钯反应进行,然后消除了β-氢化物。此过程可扩展,产品适用于一系列后续转化,例如:动力学拆分(KR)和氧化性Heck-,Wacker-和易位反应。

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