N-磺酰基恶氮丙啶易于使用铜 (II) 催化剂进行亲电活化,并在这些条件下与苯乙烯反应以在烯烃的正式氨基羟基化中提供 1,3-恶唑烷。我们提出了一种涉及阳离子中间体的两步机制,以解释使用各种苯乙烯观察到的速率差异和区域选择性。根据我们的假设,一系列带有电子稳定基团的底物的氨基羟基化是成功的,1,3-二烯是铜(II)催化氨基羟基化的特别好的底物。不对称二烯的反应提供了良好到优异的烯烃选择性,考虑到我们的机制建议的阳离子中间体的稳定性,可以合理化其意义和大小。
Copper(II)-Catalyzed Aminohydroxylation of Olefins
作者:David J. Michaelis、Christopher J. Shaffer、Tehshik P. Yoon
DOI:10.1021/ja067894t
日期:2007.2.1
We report a novel copper(II)-catalyzed aminohydroxylation in which both heteroatoms of an N-sulfonyl oxaziridine are added across an alkene in a regioselective fashion. A variety of styrenes and electron-rich alkenes can be aminohydroxylated using this protocol. Preliminary investigations indicate that this new process is a rare non-oxenoid reaction of N-sulfonyl oxaziridines, involving a stepwise, polar mechanism rather than a concerted process.