Controllable synthesis of pyrido[2,3-<i>b</i>]indol-4-ones or indolo[3,2-<i>b</i>]quinolines <i>via</i> formal intramolecular C(sp<sup>2</sup>)–H functionalization
作者:Bo Song、Mengdan Wang、Murong Xu、Lingkai Kong、Huihui Xie、Chengyu Wang、Yanzhong Li
DOI:10.1039/c9ob02108f
日期:——
controllable synthesis of pyrido[2,3-b]indol-4-ones or indolo[3,2-b]quinolines has been developed by using indole-2-carboxylic derivatives as starting materials. Indole-2-carboxenamines were transformed into pyrido[2,3-b]indol-4-ones through intramolecular N–H/C–H coupling, in which a carbonyl 1,2-migration was involved. Whereas, when indole-2-carboxarylamines were employed, indolo[3,2-b]quinolones were
以吲哚-2-羧酸衍生物为原料,开发了一种新型的铁催化可控合成吡啶并[2,3 - b ]吲哚-4-酮或吲哚[3,2- b ]喹啉的方法。吲哚-2-羧胺通过分子内N–H / C–H偶联转变为吡啶[2,3- b ]吲哚-4-酮,其中涉及羰基1,2-迁移。而当使用吲哚-2-羧芳基胺时,吲哚[3,2- b ]喹诺酮是通过直接的NH / CH偶联而产生的。在温和的反应条件下以中等至良好的收率在宽范围的底物范围内获得所需产物。通过该反应可方便地制备天然产物喹啉啉酮。