Synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) via multi-component reactions by using silica-bonded sulfamic acid derivatives

Authors

Khodabakhsh Niknam Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169 Iran.

Shekoofeh Tayebi Young Researchers Club, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran.

Abstract:

The one-pot, multi-component synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) by tandem Knoevenagel-Michael reaction of phenylhydrazine, ethyl acetoacetate and aldehydes in the presence of silica-bonded N-propylpiperazine sulfamic acid (SBPPSA) as a recyclable solid acid catalyst was reported. SBPPSA showed much the same efficiency when used in consecutive reaction runs.

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Journal title

Iranian Journal of Catalysis

volume 2 issue 2

pages 69- 74

publication date 2012-06-01

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Keywords

Silica-bonded N-propylpiperazine sulfamic acid Catalyst aldehydes 4 4′-(Arylmethylene)bis(1H-pyrazol-5-ols) Multi-component reactions

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