作者:Michael C. Haibach、Indubhusan Deb、Chandra Kanta De、Daniel Seidel
DOI:10.1021/ja110713k
日期:2011.2.23
Aminobenzaldehydes react with indoles in an unprecedented cascade reaction. This acid-catalyzed redox-neutral annulation proceeds via a condensation/1,5-hydride shift/ring-closure sequence. Polycyclic azepinoindoles and related compounds are obtained in a single step with good to excellent yields.
Diastereoselective Spirocyclization via Intramolecular C(
<i>sp</i>
<sup>3</sup>
)−H Bond Functionalization Triggered by Sequential [1,5]‐Hydride Shift/Cyclization Process: Approach to Spiro‐tetrahydroquinolines
作者:Arup Bhowmik、Sumit Das、Writhabrata Sarkar、K. M. Saidalavi、Aniket Mishra、Anupama Roy、Indubhusan Deb
DOI:10.1002/adsc.202001011
日期:2021.2.2
functionalization triggered by sequential [1,5]‐ hydrideshift /cyclization sequence using ortho amino benzaldehydes and active methylene compounds such as 2‐coumaranone, 4‐hydroxycoumarin, 3‐coumaranone, and 3‐isochromanone. This protocol provides a Lewis acid catalyst‐free straight forward one‐pot reaction in cases of 2‐coumaranone and 4‐hydroxycoumarin, Lewis acid‐catalyzed stepwise reaction for 3‐coumaranone