Ytterbium(III) Triflate Catalyzed Synthesis of Quinoline Derivatives from N-Arylaldimines and Vinyl Ethers

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Abstract
[4+2] Cycloaddition reaction of N-arylaldimines with vinyl ethers is effectively catalyzed by ytterbium(III) triflate to give quinoline derivatives in good yields. Furthermore, the reaction with silyl enol ethers affords 4-siloxytetrahydroquinolines, whereas an imino aldol reaction takes place in the reaction with ketene silyl acetals.