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Sulfonic acid functionalized silica catalyzed the three-component reaction of aromatic amines, alpha,beta-unsaturated aldehydes and beta-keto esters forming the corresponding 1,4-dihydropyridines in short reaction times and in high yields.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Sulfonic Acid Functionalized Silica: An Efficient Heterogeneous Catalyst for a Three-Component Synthesis of 1,4-Dihydropyridines under Solvent-Free Conditions