Reactivity studies on 4-aminopyrones: Access to benzimidazole and benzimidazolone derivatives
作者:Mohamed Amari、Mokhtar Fodili、Bellara Nedjar-Kolli、AlgÉrie Pascal Hoffmann、Jacques PÉriÉ
DOI:10.1002/jhet.5570390429
日期:2002.7
Reaction of pyrone 1a or tetronic acid 1b with o-phenylenediamine derivatives gave enaminone compounds 2. When reacting with different electrophiles, these intermediates allowed versatile access to different heterocyclic structures: when DMA derivatives or triphosgene was used, cyclization occurred through nitrogen, leading to benzimidazoles 3 and benzimidazolones 4, respectively, while reaction with
吡喃酮1a或tetronic酸1b与邻苯二胺衍生物反应,得到烯胺酮化合物2。当与不同的亲电试剂反应时,这些中间体可以通用地进入不同的杂环结构:当使用DMA衍生物或三光气时,环化反应通过氮发生,分别导致苯并咪唑3和苯并咪唑酮4,而与苯甲醛反应生成苯并二氮杂5。