α-Alkyl β-amino esters are available in high diastereoselectivity through a silicon-free Claisen enolate [3,3]-sigmatropic rearrangement of enamide esters. Optimisation studies have probed the crucial role of the initial enolisation and the nature of the enamide N-centre. The demonstration of chirality transfer and the formation of β-proline systems, is also presented.
通过无
硅的Claisen烯醇酸酯[3,3]-σ重排的酰胺酯,可以高非对映选择性获得α-烷基β-
氨基酯。优化研究已经探究了初始烯醇化的关键作用以及烯酰胺N中心的性质。还介绍了手性转移和β-脯
氨酸系统形成的演示。