Palladium(II)-Catalyzed Oxidative Cyclization of Allylic Tosylcarbamates: Scope, Derivatization, and Mechanistic Aspects
作者:Antoine Joosten、Andreas K. Å. Persson、Renaud Millet、Magnus T. Johnson、Jan-E. Bäckvall
DOI:10.1002/chem.201202359
日期:2012.11.19
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.
据报道,高可用的氧化钯(II)催化(Wacker型)可轻易获得的烯丙基甲苯磺基氨基甲酸酯的环化反应。这种操作简单的催化反应可提供高收率和出色的非对映选择性(> 20:1)的甲苯磺酰基保护的乙烯基恶唑烷酮类化合物,它们是合成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。标题反应显示为通过整体反式进行烯烃的氨基缩钯反应,然后消除β-氢化物。此过程具有可扩展性,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。