The Yb(OTf)3 catalyzed formal aza-Diels-Alder (or Povarov) reaction of cyclopentadiene and 1,3-cyclohexadiene with in situ-generated N-arylimines under conventional/ultrasonic techniques is herein described. This kind of three-component Povarov reaction results in quinoline and phenanthridine derivatives, which are important biological compounds.
Keywords: Aza-Diels–Alder reaction; Lanthanide triflates; Multi-component reaction; Phenanthridine; Quinoline; Ultrasonic irradiation.
Copyright © 2014 Elsevier B.V. All rights reserved.