Lewis Acid-Promoted Three-Component Reactions of Propargylic Alcohols with 2-Butynedioates and Secondary Amines
作者:Guangwei Yin、Yuanxun Zhu、Ping Lu、Yanguang Wang
DOI:10.1021/jo2016407
日期:2011.11.4
We report herein a three-component reaction of propargylic alcohols with 2-butynedioates and secondary amines, which furnished functionalized dihydroazepines. In the cases where benzylmethylamine and benzyl-i-propylamine were used as the secondary amine, the reaction afforded 2,5-dihydro-1H-pyrroles and 2,3-dihydro-1H-pyrroles, respectively, as the major product along with the desired dihydroazepines
我们在这里报道了炔丙醇与2-丁炔二酸酯和仲胺的三组分反应,这提供了官能化的二氢a庚因。在苄基和苄基的情况下,我丙胺用作仲胺,反应,得到2,5-二氢-1- ħ -pyrroles和2,3-二氢-1- ħ主要产物分别为-吡咯和所需的二氢a庚因。反应模式取决于取代基对所用仲胺的电子和空间效应。推测出该级联过程的尝试性机制。关键中间体归因于1,3,4-戊三烯-1-胺,它是通过用烯胺捕获原位生成烯丙基碳阳离子而形成的。由于形成的1,3,4-戊三烯-1-胺具有反应性,因此形成了不同的产物。