Lewis Acid Mediated Asymmetric [2,3]-Sigmatropic Rearrangement of Allylic Amines. Scope and Mechanistic Investigation
作者:Jan Blid、Olaf Panknin、Pavel Tuzina、Peter Somfai
DOI:10.1021/jo062178v
日期:2007.2.1
The first asymmetric [2,3]-sigmatropic rearrangement of achiral allylic amines has been realized by quaternization of the amines with an enantiomerically pure diazaborolidine and subsequent treatment with Et3N. The resultant homoallylic amines were obtained in good yields and excellent ee's. The observed diastereo- and enantioselectivities were rationalized by invoking a kinetically controlled process
通过用对映体纯的二氮杂硼烷胺对胺进行季铵化并随后用Et 3 N处理,已实现了非手性烯丙基胺的第一个不对称[2,3]-σ重排。观察到的非对映体和对映体选择性通过调用动力学控制过程得以合理化,并且通过手性路易斯酸-底物复合物的NMR光谱研究获得了对该模型的支持。通过X射线晶体学分析建立了路易斯酸产物配合物的结构,并支持了所提出的机理。