Synthesis of angular-substituted tetracyclic azepino-indole derivatives via N-acyliminium ion cyclization
作者:Yong Sup Lee、Byung Joon Min、Yong Kyu Park、Jae Yeol Lee、Sook Ja Lee、Hokoon Park
DOI:10.1016/s0040-4020(99)00808-x
日期:1999.11
A concise and efficient synthesis of tetracyclic azepino-indole derivatives 2 having a substituent at the angular position has been accomplished through an N-acyliminium ion cyclization. The coupling reaction of indol-3-yl-ethylamine 3 with 4-or 5-keto-acid 4 followed by cyclization reaction of the resulting tautomeric mixtures of keto-amide 5 and hydroxylactam 6 in refluxing formic acid provided 2
通过N-酰基亚胺离子环化,已经完成了对角位置具有取代基的四环氮杂环庚烷-吲哚衍生物2的简洁而有效的合成。吲哚-3-基-乙基胺的偶联反应3与4-或5-酮酸4随后酮-酰胺的所得的互变异构混合物的环化反应5和羟基内酰胺6在回流甲酸提供2。