Fine tuning the outcome of 1,3-dipolar cycloaddition reactions of benzimidazolium ylides to activated alkynes
作者:Emilian Georgescu、Alina Nicolescu、Florentina Georgescu、Florina Teodorescu、Sergiu Shova、Adriana T. Marinoiu、Florea Dumitrascu、Calin Deleanu
DOI:10.1016/j.tet.2016.03.086
日期:2016.5
1,3-Dipolar cycloaddition reactions of benzimidazolium ylides, generated from 3-phenacylbenzimidazolium bromides, to non-symmetrical activated dipolarophiles in various reaction conditions led to complex mixtures of pyrrolo[1,2-a]benzimidazole and pyrrolo[1,2-a]quinoxaline derivatives. In order to explain all experimental results, the influence of reaction conditions on the reaction products was investigated
在各种反应条件下,由3-苯甲基苯并咪唑鎓溴化物生成的苯并咪唑鎓烷基化物的1,3-偶极环加成反应与非对称活化偶极亲和剂导致吡咯并[1,2- a ]苯并咪唑和吡咯并[1,2- a的复杂混合物]喹喔啉衍生物。为了解释所有实验结果,研究了反应条件对反应产物的影响。首次出现4-羟基-4,5-二氢吡咯并[1,2 - a ]喹喔啉衍生物6,吡咯并[1,2- a ]喹喔啉季盐8以及4-甲氧基-4,5-二氢吡咯并酮[1,2- a ]喹喔啉9被分离出来,被充分表征,并提出它们的相互转化,以及提出的反应机理。