Montmorillonite KSF-Catalyzed One-Pot, Three-Component, Aza-Diels–Alder Reactions of Methylenecyclopropanes with Arenecarbaldehydes and Arylamines

A series of novel quinoline derivatives having a spirocyclopropyl ring can be synthesized by one-pot, three-component aza-Diels–Alder reactions of arenecarbaldehydes, arylamines, and methylenecyclopropanes (MCPs) using a heterogeneous solid acid catalyst, montmorillonite KSF, under mild reaction conditions in good to excellent yields.