Chiral Phosphoric Acid-Catalyzed Pictet–Spengler Reactions for Synthesis of 5′,11′-Dihydrospiro[indoline-3,6′-indolo[3,2-<i>c</i>]qui-nolin]-2-ones Containing Quaternary Stereocenters
作者:Xin-Wei Wang、Xiang Li、Mu-Wang Chen、Bo Wu、Yong-Gui Zhou
DOI:10.1021/acs.joc.1c00289
日期:2021.5.7
Chiral phosphoric acid-catalyzed Pictet–Spengler reactions of 2-(1H-indolyl)aniline derivatives and isatins by the condensation/cyclization process have been realized. A series of enantioenriched 5′,11′-dihydrospiro[indoline-3,6′-indolo[3,2-c]quinolin]-2-ones bearing quaternary stereogenic centers were obtained with excellent yields and up to >99% ee. This protocol was suitable for the Pictet–Spengler
通过缩合/环化过程,实现了手性磷酸催化2-(1 H-吲哚基)苯胺衍生物和靛红的Pictet-Spengler反应。获得了一系列带有季生立体中心的对映体富集的5',11'-二氢螺[indoline-3,6'-吲哚[3,2- c ]喹啉] -2-酮,具有优异的收率和高达> 99%的ee。该方案适用于2-(1-苄基-5-甲基-1 H-吡咯-2-基)苯胺和各种1',5'-dihydro-spiro [indoline-3]的Pictet-Spengler反应也可以以良好的产率和高达88%的ee获得,4′-吡咯并[3,2- c ]喹啉] -2-酮。