One-Pot Synthesis of Imidazole-4-Carboxylates by Microwave-Assisted 1,5-Electrocyclization of Azavinyl Azomethine Ylides
作者:Lisa Preti、Orazio A. Attanasi、Emilia Caselli、Gianfranco Favi、Claudia Ori、Paolo Davoli、Fulvia Felluga、Fabio Prati
DOI:10.1002/ejoc.201000434
日期:2010.8
Diversely functionalized imidazole-4-carboxylates were synthesized by microwave-assisted 1,5-eletrocyclization of 1,2-diaza-1,3-diene-derived azavinyl azomethine ylides. 1,2-Diaza-1,3-dienes were treated with primary aliphatic or aromatic amines and subjected to microwave irradiation in the presence of aldehydes. 3-Alkyl- and 3-arylimidazole-4-carboxylates were prepared in good yields through a one-pot
通过微波辅助1,2-二氮杂-1,3-二烯衍生的氮杂乙烯基偶氮甲亚胺的1,5-电环合成了功能不同的咪唑-4-羧酸酯。用伯脂族或芳族胺处理1,2-二氮杂-1,3-二烯,并在醛存在下进行微波辐射。通过一锅多组分方法以高收率制备了3-烷基-和3-芳基咪唑-4-羧酸酯。在C-2,N-3和C-5处取代基的调节是可能的,并且当使用低聚甲醛时获得了2-未取代的咪唑。