Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (5): 538-543.DOI: 10.11944/j.issn.1000-0518.2018.05.170279

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Synthesis and Antioxidant Activity of Coumarin Schiff Base Derivatives

FENG Cuia,MIN Manb,XIE Rongronga,REN Jianhuia,CHEN Lina*()   

  1. aSchool of Pharmacy,Guangdong Pharmaceutical University,Guangzhou 510006,China
    bCollege of Traditional Chinese Medicine,Guangdong Pharmaceutical University,Guangzhou 510006,China
  • Received:2017-08-10 Accepted:2018-01-24 Published:2018-04-23 Online:2018-04-23
  • Contact: CHEN Lin
  • Supported by:
    Supported by the Science and Technology Planning Project of Guangdong Province, China(No.2012B061700040);the Medical Science and Technology Research Fund Project of Guangdong Province, China(No.201618171249486)

Abstract:

Two Coumarin Schiff base derivatives were synthesized from 2,3,4-trimethoxybenzaldehyde by demethylation, Knoevenagel and nucleophilic addition reaction. Structures of the corresponding products were elucidated through the analysis of 1H NMR and MS spectra. The antioxidant activities of two derivatives were evaluated by quenching 2,2'-diphenyl-1-picrylhydrazyl radical(DPPH), 2,2'-azinobis(3-ethylbenzothiazoline-6-sulphonate) ammonium salt cationic radical(ABTS), and hydroxyl free radical. The result shows that the target compounds can quench the three types of free radicals. Compared to 7,8-dimethoxy-3-aminocoumarin, two coumarin Schiff base derivatives have higher quenching activity for DPPH and hydroxyl free radical and have higher antioxidant activity.

Key words: coumarin Schiff base, antioxidant