The intermolecular hetero-Diels–Alder reaction of in situ-generated o-quinomethanes and unactivated alkenes has been accomplished through a wet montmorillonite catalyst in a LiClO4–MeNO2 solution to give good yields of varied chromane skeletons.
K. Chiba, T. Hirano, Y. Kitano and M. Tada, Chem. Commun., 1999, 691 DOI: 10.1039/A900657E
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