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Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry Volume 42, 2012 - Issue 2
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Original Articles

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

Amir Khojastehnezhad Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, I. R. Iran
,
Farid Moeinpour Department of Chemistry, Bandar Abbas Branch, Islamic Azad University, Bandar Abbas, I. R. Iran
&
Alireza Shams Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, I. R. Iran
Pages 273-277 | Received 23 Apr 2011, Accepted 29 Jul 2011, Published online: 23 Mar 2012
 
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Abstract

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 work-up procedures.

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