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

Abstract 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.