Syntheses and Characterization of N-(Indolyl)pyridinium Salts and of Their Ylides
作者:Nazar Pidlypnyi、Sandra Kaul、Sebastian Wolf、Martin H. H. Drafz、Andreas Schmidt
DOI:10.5560/znb.2014-3324
日期:2014.5.1
3-Methylindole reacts with pyridines in the presence of NBS to give indol-2-yl-pyridinium salts which were converted into their ylides by an anion exchange resin in its hydroxide form. Indol-3- amine was subjected to a nucleophilic ring transformation with pyrylium salts which resulted in the formation of indol-3-yl-pyridinium salts, the 2,4,6-trimethylpyridinium derivative of which proved to be unstable. The
3-甲基吲哚在 NBS 存在下与吡啶反应生成吲哚-2-基-吡啶鎓盐,通过阴离子交换树脂将其转化为氢氧化物形式的叶立德。吲哚-3-胺与吡啶鎓盐进行亲核环转化,导致形成吲哚-3-基-吡啶鎓盐,证明其2,4,6-三甲基吡啶鎓衍生物是不稳定的。2,4,6-三苯基吡啶鎓衍生物去质子化为相应的叶立德。异构吲哚-2-基和吲哚-3-基衍生物是环亚胺鎓叶立德,它们是杂环内消旋甜菜碱(MB)化合物类别的成员。相比之下,吲哚-2-基-吡咯烷鎓的叶立德是环铵叶立德。它是通过 3-甲基吲哚与吡咯烷在 NBS 存在下反应,然后去质子化制备的。