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An efficient synthesis of 1,4-dihydropyridine & polyhydroquinolien   derivatives using b-Cyclodextrin-polyurethane polymer (β-CDPU) as a   stationary microvessel and neutral heterogeneous catalyst via a four   component coupling of aldehydes, β-ketoester (2 mol) and ammonium acetate   under solvent-free conditions is described. Compared with the classical   Hantzsch reaction, this new method has the advantages of good yield, short   reaction time and methodological simplicity. β-CDPU was proved to be an   efficient heterogeneous catalyst which could be easily handled and removed   from the reaction mixture by simple filtration, and also recovered and   reused without loss of reactivity

journal of the serbian chemical society

β-cyclodextrin-polyurethane polymer: A neutral and eco-friendly heterogeneous catalyst for the one-pot synthesis of 1,4-dihydropyridine and polyhydroquinolien derivatives via Hantzsch reaction under solvent-free conditions