Polymer-Supported Hantzsch 1,4-Dihydropyridine Ester: An Efficient Biomimetic Hydrogen Source for the Reduction of Ketimines and Electron-Withdrawing Group Conjugated Olefins
作者:Jun Che、Yulin Lam
DOI:10.1002/adsc.201000093
日期:——
A polymer‐supported Hantzsch 1,4‐dihydropyridine ester was observed to be a useful selective reducing agent for the reduction of ketimines and electron‐withdrawing conjugated olefins. The rate of the reduction of electron‐withdrawing conjugated olefins is dependent on the nature of the conjugated substituents and could be enhanced by microwave irradiation. The reduction of (Z)‐α‐cyano‐β‐bromomethylcinnamates
观察到聚合物支持的Hantzsch 1,4-二氢吡啶酯是用于还原酮亚胺和吸电子共轭烯烃的有用的选择性还原剂。吸电子共轭烯烃的还原速率取决于共轭取代基的性质,可以通过微波辐射来提高。发现使用聚合物负载的Hantzsch 1,4-二氢吡啶酯将(Z)-α-氰基-β-溴甲基肉桂酸酯还原为环丙烷衍生物可以立体选择性地进行且收率很高。