Asymmetric Organocatalytic Stepwise [2+2] Entry to Tetra-Substituted Heterodimeric and Homochiral Cyclobutanes
作者:Alex J. Nielsen、Hilary A. Jenkins、James McNulty
DOI:10.1002/chem.201601842
日期:2016.6.27
An asymmetric synthesis of tetra‐substituted cyclobutanes involving an organocatalytic, stepwise [2+2]‐cycloaddition is described. The secondary‐amine‐catalyzed method allows for the hetero‐dimerization of two different cinnamic‐acid‐derived sub‐units, opening a novel one‐step assembly to densely functionalized, head‐to‐tail coupled dimeric cyclobutanes in high enantiomeric excess. A series of selective
描述了涉及有机催化逐步[2 + 2]-环加成反应的四取代环丁烷的不对称合成。仲胺催化的方法允许两个不同的肉桂酸衍生的亚基进行异二聚,从而为高密度对映体过量的,功能密集的,头对尾偶联的二聚环丁烷打开了一种新型的一步组装方式。还描述了这些敏感的环加合物中的一系列选择性合成互变。