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| PPA-SiO2 catalyzed efficient synthesis of polyhydroquinoline derivatives through Hantzsch multicomponent condensation under solvent-free conditions |
| Amir Khojastehnezhada, Farid Moeinpourb, Abolghasem Davoodniaa |
a Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad 91735-413, Iran;
b Department of Chemistry, Faculty of Sciences, Islamic Azad University, Bandar Abbas Branch, Iran |
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Abstract Silica gel-supported polyphosphoric acid (PPA-SiO2) was found to be an efficient catalyst for the one-pot four-component Hantzsch condensation reaction of aryl aldehydes, dimedone, ethyl acetoacetate and ammonium acetate to afford the corresponding polyhydroquinoline derivatives in high yields. The main advantages of the present approach are short reaction times, clean reaction profiles, simple experimental and workup procedures.
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Received: 25 October 2010
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Corresponding Authors:
Amir Khojastehnezhad, E-mail address:akhojastehnezhad@yahoo.com
E-mail: akhojastehnezhad@yahoo.com
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