Abstract
A new environmentally benign method for the preparation of hydropyridine derivatives has been developed by a simple one-pot condensation reaction of dimidine, active methylene compounds with aldehydes, and ammonium acetate in the presence of polystyrene-supported p -toluenesulfonic acid as a highly active and reusable heterogeneous acid catalyst under solvent-free conditions at 60 °C. This new protocol has the advantages of easy availability, stability, reusability, and eco-friendliness of the catalyst, high to excellent yields, simple and easy experimental workup procedure.
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