Azavinyl Azomethine Ylides from Thermal Ring Opening of α-Aziridinohydrazones: Unprecedented 1,5-Electrocyclization to Imidazoles
作者:Orazio A. Attanasi、Paolo Davoli、Gianfranco Favi、Paolino Filippone、Arrigo Forni、Giada Moscatelli、Fabio Prati
DOI:10.1021/ol701522t
日期:2007.8.1
in the formation of alpha-aziridinohydrazone adducts. In toluene under reflux, alpha-aziridinohydrazones gave imidazoles in moderate to good yields. Such a reactivity pattern is explained by 1,5-electrocyclization of azavinyl azomethine ylide generated through thermal ring opening of alpha-aziridinohydrazones.
在无溶剂条件下(SFC),将氮丙啶羧酸酯的迈克尔型加成到1,2-二氮杂-1,3-丁二烯中导致形成α-叠氮基hydr加合物。在回流下的甲苯中,α-叠氮基hydr偶氮化合物以中等至良好的收率得到咪唑。通过由α-叠氮基hydr肼的热开环产生的氮杂乙烯基偶氮甲meth叶立德的1,5-电环化可以解释这种反应性模式。