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Tsuji-Trost反应

 有机合成公众号 2020-11-03


钯催化下利用烯丙基化合物(如乙酸烯丙酯和烯丙基溴)对亲核试剂(如活性亚甲基化合物,烯醇化合物,胺和酚)进行烯丙基化的反应。


反应机理

 Pd(0)-催化剂对双键进行配位得到 η2 π-烯丙基络合物。然后氧化加成,在此过程中离去基团离去,得到 η3 π-烯丙基络合物。此过程也被称为离子化过程:

根据亲核试剂的强度,此反应可能经过两种不同反应历程。弱亲核试剂(Soft nucleophiles,其共轭酸的pKa < 25)直接加成到烯丙基片段上。而强亲核试剂(ard nucleophiles)首先进攻金属中心,接着还原消除得到烯丙基化合物:

这两种反应机理模型对于不对称的Tsuji-Trost 反应有至关重要的影响。对于这方面的讨论,可以参阅 Trost 和 Vranken 的研究 (Chem. Rev.1996, 96, 395. DOI)。

不对称的烯丙基底物一般在位阻较小的一侧进行取代,空间选择性也和亲核试剂的大小有关:

空间位阻较小的亲核试剂(如苯酚)得到空间上更加拥挤的产物。

与此反应类似的反应常用到钼或铱类催化剂。这些反应与Tsuji-Trost反应相同,常常得到空间上更拥挤的异构体:

A. Leitner, C. Shu, J. F. Hartwig, Org. Lett.20057, 1093-1096.

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编译自:Organic Chemistry Portal

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