Transition Metal-Catalyzed Hetero-[5 + 2] Cycloadditions of Cyclopropyl Imines and Alkynes: Dihydroazepines from Simple, Readily Available Starting Materials
作者:Paul A. Wender、Torben M. Pedersen、Marc J. C. Scanio
DOI:10.1021/ja0285013
日期:2002.12.1
The first example of a transition metal-catalyzed hetero-[5 + 2] cycloaddition reaction is described. Use of cyclopropyl imines as five-atom components, an alkyne as a two-carbon component, and a Rh(I) catalyst enables a new route to dihydroazepines. This new hetero-[5 + 2] cycloaddition works well with aldimines, ketimines, and with substituted cyclopropanes and affords the desired dihydroazepines
描述了过渡金属催化的杂-[5 + 2] 环加成反应的第一个例子。使用环丙基亚胺作为五原子组分、炔烃作为双碳组分和 Rh(I) 催化剂为二氢氮杂化合物开辟了一条新途径。这种新的杂 [5 + 2] 环加成与醛亚胺、酮亚胺和取代的环丙烷一起使用效果很好,并以单一区域异构体的形式以优异的产率提供所需的二氢氮杂。使用连续亚胺形成/氮杂-[5 + 2] 环加成在一次操作中从三种可商购的起始材料产生所需的二氢氮杂。该反应已按比例得到克量的二氢氮杂。