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The Ln(OTf) 3 -catalyzed formal aza-Diels-Alder (or Povarov) reaction of cyclopentadiene with in situ generated N-arylimines containing enolizable protons is described. This three-component Povarov reaction generates highly functionalized C-2 aliphatic substituted tetrahydroquinolines, heterocycles that were previously inaccessible using the Povarov reaction, because of the instability of...
A novel dysprosium(III) catalyzed 2:1 coupling reaction between substituted anilines and 2 equiv. of dihydrofuran that yields substituted hexahydrofuro[3,2-c]quinolines is described. The reaction proceeds via a formal Diels-Alder process between an in situ generated 2-azadiene with another equivalent of dihydrofuran and may proceed either through a stepwise or an asynchronous concerted mechanism.
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