Synthesis and Antioxidant Properties of Two New Derivatives of Indeno-Benzofuran

Document Type : Original Article


1 Assistant Professor of Biochemistry, Young Researchers and Elite Club, Yadegar - e- Imam Khomeini (RAH) shahr-e-Rey Branch, Islamic Azad University, Tehran, Iran

2 Associate Professor of Organic Chemistry, Young Researchers and Elite Club, Yadegar - e- Imam Khomeini (RAH) shahr-e-Rey Branch, Islamic Azad University, Tehran, Iran

3 Assistant Professor of Microbiology, Medicinal Plants and Drug Research Institute, Shahid Beheshti University, Tehran, Iran


Ninhydrin reacts with poly-phenols in different ratios to produce tetracyclic adducts. Here, pyrogallol was used as a polyphenol compound. In the company of acidic ionic liquid (AIL), there was a selective reaction between the ortho-site of polyphenol and the ninhydrin’s carbonyl group. Mono-adduct (1:1) 3 and bis-adduct (2:1) 4 were prepared as a solvent and a catalyst for the reaction of ninhydrin with pyrogallol in 1-(carboxymethyl)-3-methyl-1H-imidazolium chloride (mcmimCl). Purity of the products was approved by 1H NMR, 13C NMR, IR and Mass Spectroscopy. Moreover, the antioxidant activity of novel derivatives investigated in this paper by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical assay and butylated hydroxytoluene (BHT) was considered to be standard. The results indicated that mono-adduct showed the strongest antioxidant activity (IC50 = 5.289µg/ml). 


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Volume 10, Issue 1
February 2020
Pages 75-80
  • Receive Date: 10 May 2019
  • Revise Date: 26 February 2020
  • Accept Date: 17 August 2019
  • First Publish Date: 26 February 2020