作者:Eugene E. Kwan、Jonathan R. Scheerer、David A. Evans
DOI:10.1021/jo302138z
日期:2013.1.4
We present a general model for understanding the stereochemical course of intramolecular Michael reactions. We show that the addition of β-ketoester enolates to α,β-unsaturated esters and imides bearing adjacent stereocenters (X, Y = H, Me, OR) leads to high levels of asymmetric induction. Reinforcing and nonreinforcing stereochemical relationships are evaluated from the syn and anti reactant diastereomers
我们提出了一个一般的模型,以了解分子内迈克尔反应的立体化学过程。我们表明,向相邻的立构中心(X,Y = H,Me或OR)的α,β-不饱和酯和酰亚胺中添加β-酮酸酯烯酸酯会导致高水平的不对称诱导。从同反抗非对映异构体评估增强和非增强立体化学关系。在合成,光谱和计算研究的基础上,我们建议可以通过偶极子最小化的椅子过渡态模型来合理化这些反应的结果。