The combination of electron-poor azomethine ylides 3 (AMY-I) or 4 (AMY-II) with electron-rich enamines 5 results in nonstereospecific 1,3-dipolar cycloadditions, which are LUMOdipole-HOMOdipolarophile controlled reactions. This phenomenon can be explained only by a two-step mechanism via zwitterionic intermediates.
贫电子甲
亚胺叶立德的组合3(
AMY-I)或4(
AMY-II)与富电子烯胺5周的结果在nonstereospecific 1,3-偶极环加成,其LUMO偶极-HOMO亲偶极控制的反应。这种现象只能通过两性离子中间体的两步机理来解释。