3.9 Article

PPA-SiO2 Catalyzed One-Pot Synthesis of 1,4-Dihydropyridines Under Solvent-Free Conditions

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TAYLOR & FRANCIS INC
DOI: 10.1080/15533174.2011.609858

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1,4-dihydropyridines; heterogeneous catalyst; one-pot reaction; PPA-SiO2; silica-supported polyphosphoric acid; solvent-free

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Silica gel-supported polyphosphoric acid (PPA-SiO2) was found to be an efficient catalyst for the one-pot condensation reaction of aryl aldehydes, ethyl acetoacetate, and ammonium acetate to afford the corresponding 1,4-dihydropyridines in excellent yields. The main advantages of the present approach are short reaction times, clean reaction profiles, and simple experimental and workup procedures.

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