Facile Synthesis of Dihydroquinoline-Fused Canthines by Intramolecular Aza-Diels-Alder Reaction
作者:Samiran Hutait、Virender Singh、Sanjay Batra
DOI:10.1002/ejoc.201000925
日期:2010.11
The synthesis of dihydroquinoline-fusedcanthines by intramolecular aza-Diels―Alder reaction between N-prenylated 1-formyl-9H-β-carbolines and substituted anilines in the presence of a Lewis acid, followed by oxidation, is described. Additionally, it has been found that the N-protected aldehyde in the presence of a suitable catalyst [ZnBr 2 or Yb(OTf) 3 ] undergoes intramolecular carbonyl-ene reaction