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

volume 2  issue 2

pages  69- 74

publication date 2012-06-01

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