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‐substitutedcyclobutanes 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