PPh<sub>3</sub>-Catalyzed Reactions of Alkyl Propiolates with<i>N</i>-Tosylimines: A Facile Synthesis of Alkyl 2-[aryl(tosylimino)methyl]acrylate and an Insight into the Reaction Mechanism
作者:Huimin Liu、QiongMei Zhang、Limin Wang、Xiaofeng Tong
DOI:10.1002/chem.200902105
日期:2010.2.8
A new PPh3‐catalyzed synthesis of alkyl 2‐[aryl(tosylimino)methyl]acrylates from propiolate and N‐tosylimine has been developed. Deuterium‐labelling experiments show that the reaction mechanism involves several hydrogen‐transfer processes, which are not the turnover‐limiting step and strongly rely on the nature of the reaction media. The stable phosphonium–enamine zwitterion, which was proven to play
已经开发了一种新的由PPh 3催化的丙酸酯和N-甲苯磺酰亚胺合成2- [芳基(甲苯磺酰基)甲基]丙烯酸烷基酯的方法。氘标记实验表明,反应机理涉及数个氢转移过程,这些过程不是限制流通的步骤,并且强烈依赖于反应介质的性质。X射线分析已分离出稳定的phospho-烯胺两性离子,并证明了其在催化循环中的重要作用。