Selective Synthesis of Pyrazolonyl Spirodihydroquinolines or Pyrazolonyl Spiroindolines under Aerobic or Anaerobic Conditions
作者:Caiyun Yu、Yuanshuang Xu、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.2c03952
日期:2022.12.30
seven-membered ruthenacycle species serving as a key intermediate through Ru(II)-catalyzed C–H/N–H bonds metalation, carbene formation, and its migratory insertion. When the reaction is carried out under air, the key intermediate undergoes reductive elimination to afford spirodihydroquinoline. When the reaction is run under argon, the key intermediate undergoes protonation and intramolecular nucleophilic
本文介绍的是通过 2-烯基苯胺与重氮吡唑啉酮的正式 [5 + 1] 或 [4 + 1] 螺环化,条件控制选择性合成吡唑啉基螺二氢喹啉或吡唑啉基螺二氢吲哚。从机理上讲,标题产物的形成涉及通过 Ru(II) 催化的 C-H/N-H 键金属化、卡宾形成及其迁移,初始生成吡唑啉基螺稠合七元钌环物种作为关键中间体插入。当反应在空气中进行时,关键中间体发生还原消除,得到螺二氢喹啉。当反应在氩气下运行时,关键中间体会发生质子化和分子内亲核加成反应,生成螺二氢吲哚。2 )–H 键,允许在广泛的底物上快速和选择性地组装有价值的螺旋支架。