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Molecules 2011, 16(11), 9041-9048; doi:10.3390/molecules16119041
Article

One-Pot and Efficient Synthesis of Triazolo[1,2-a]indazole-triones via Reaction of Arylaldehydes with Urazole and Dimedone Catalyzed by Silica Nanoparticles Prepared from Rice Husk

1,* , 2
,
3
 and
1
1 Department of Chemistry, Payame Noor University (PNU), P.O. Box 19395-369776175-559, TehranKerman, Iran 2 Mining and Engineering Department of Zarand, Shahid Bahonar University, Kerman, 76169-14111, Iran 3 Department Institute of Materials Environmental Science, International Center for Science and High Technology and Environmental Science, P.O. Box 76315-117, Kerman, Iran
* Author to whom correspondence should be addressed.
Received: 19 September 2011 / Revised: 13 October 2011 / Accepted: 20 October 2011 / Published: 26 October 2011
(This article belongs to the Special Issue Microwave Assisted Synthesis)
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Abstract

A novel synthesis of triazolo[1,2-a]indazole-1,3,8-trione derivatives by reaction of urazole, dimedone and aromatic aldehydes under conventional heating and microwave irradiation and solvent-free conditions using silica nanoparticles prepared from rice husk ash as catalyst is described. The new method features high yields, multicomponent reactions and environmental friendliness.
Keywords: multicomponent reaction; nanosilica sulfuric acid; microwave irradiation; rice husk multicomponent reaction; nanosilica sulfuric acid; microwave irradiation; rice husk
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Hamidian, H.; Fozooni, S.; Hassankhani, A.; Mohammadi, S.Z. One-Pot and Efficient Synthesis of Triazolo[1,2-a]indazole-triones via Reaction of Arylaldehydes with Urazole and Dimedone Catalyzed by Silica Nanoparticles Prepared from Rice Husk. Molecules 2011, 16, 9041-9048.

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