Dynamic Kinetic Asymmetric Synthesis of Substituted Pyrrolidines from Racemic Cyclopropanes and Aldimines: Reaction Development and Mechanistic Insights
作者:Andrew T. Parsons、Austin G. Smith、Andrew J. Neel、Jeffrey S. Johnson
DOI:10.1021/ja1032277
日期:2010.7.21
An enantioselective preparation of 2,5-cis-disubstituted pyrrolidines has been achieved via a dynamic kinetic asymmetric transformation (DyKAT) of racemic donor-acceptor cyclopropanes and (E)-aldimines. Mechanistic studies suggest that isomerization of the aldimine or resultant iminium to the Z geometry is not a pathway that furnishes the observed 2,5-cis-disubstituted products.
通过外消旋供体-受体环丙烷和 (E)-醛亚胺的动态动力学不对称转化 (DyKAT),实现了 2,5-顺式二取代吡咯烷的对映选择性制备。机理研究表明,醛亚胺或所得亚胺向 Z 几何结构的异构化不是提供观察到的 2,5-顺式二取代产物的途径。