Improved Synthesis and Reaction of 11-Chloroneocryptolepines, Strategic Scaffold for Antimalaria Agent, and Their 6-Methyl Congener from Indole-3-carboxylate
作者:Li Wang、Wen-Jie Lu、Tomohito Odawara、Ryuhei Misumi、Zhen-Wu Mei、Wei Peng、Ibrahim El-Tantawy El-Sayed、Tsutomu Inokuchi
DOI:10.1002/jhet.1617
日期:2014.7
Various 11‐chloro‐5‐methyl‐5H‐indolo[2,3‐b]quinolines (neocryptolepines) with different substituents on the quinoline ring, key intermediates for antimalaria agents, are prepared from the substituted N‐methylanilines, easily accessible by the N‐methylation of anilines, and indole‐3‐carboxylate as a counterpart. This protocol is benign in terms of the reduced number of steps to reach the target, compared
由取代的N-甲基苯胺制备喹啉环上具有不同取代基的各种11-氯-5-甲基-5 H-吲哚并[2,3- b ]喹啉(新隐油松),它们是抗疟疾药物的关键中间体,可通过以下方法容易地获得苯胺的N-甲基化,以及吲哚-3-羧酸盐的对应物。与使用苯胺的已知方法相比,该方案在减少到达目标的步骤数方面是良性的,并且产品易于纯化。或者,他们的6-甲基同源物由N制备2-芳基氨基吲哚-3-羧酸吲哚部分的甲基化,然后连续环化和氯化。在C11位置的亲核取代反应中,发现11-Chloroneocryptolepines比其6-甲基同类物更具反应性。