Unexpected 5,6,7,8,9,10-Hexahydro-6,6-pentamethylenephenanthridines and 2,3,4,5-Tetrahydro-4,4-tetramethylene-1<i>H</i>-cyclopenta[<i>c</i>]quinolines from Skraup–Doebner–Von Miller Quinoline Synthesis and Their Implications for the Mechanism of That Reaction
作者:Jean Fotie、Hilaire V. Kemami Wangun、Frank R. Fronczek、Nancy Massawe、Bijay T. Bhattarai、Jessica L. Rhodus、Thomas A. Singleton、D. Scott Bohle
DOI:10.1021/jo202681r
日期:2012.3.16
Skraup–Doebner–Von Miller quinoline synthesis remains controversial and not well understood despite several mechanistic studies reported on the matter. A series of unexpected and unusual 5,6,7,8,9,10-hexahydro-6,6-pentamethylenephenanthridines and 2,3,4,5-tetrahydro-4,4-tetramethylene-1H-cyclopenta[c]quinolines have been obtained through the Skraup–Doebner–Von Miller quinoline synthesis. On the basis
尽管已就此问题进行了几项机理研究,但Skraup–Doebner–Von Miller喹啉合成的真正机理仍存在争议,并且尚未得到很好的理解。一系列意外的和异常的5,6,7,8,9,10-六氢-6,6-戊亚甲基菲啶和2,3,4,5-四氢-4,4-四亚甲基-1 H-环戊基[ c ]喹啉已经通过Skraup–Doebner–Von Miller喹啉合成获得。基于这些出乎意料的结果,并与一些先前报道的喹啉合成相一致,针对该反应变体提出了另一种机理途径。它涉及第一步中通过酮和苯胺衍生物之间的反应形成席夫碱,然后在在苯胺衍生物的胺官能团的邻位上进行邻位,并在最后一步进行环合以封闭喹啉环,从而生成二氢喹啉衍生物。据我们所知,这是首次针对Skraup–Doebner–Von Miller喹啉合成的任何变体提出这种机制途径的报告。