Synthesis, antioxidant activity and SAR study of novel spiro-isatin-based Schiff bases

  • Fatih Sonmez
  • Zuhal Gunesli
  • Belma Zengin Kurt
  • Isil Gazioglu
  • Davut Avci
  • Mustafa Kucukislamoglu
Original Article


A new series of 21 Schiff bases of spiro-isatin was synthesized, and their DPPH, CUPRAC and ABTS cation radical scavenging abilities were investigated for antioxidant activity. The results showed that all the synthesized compounds exhibited antioxidant activity for each assay. 5̍-(2,3-Dihydroxybenzylideneamino)spiro[[1,3] dioxolane-2,3̍-indoline]-2̍-on (5c) (IC50 = 4.49 µM, for DPPH; IC50 = 0.39 µM, for ABTS.+; and A0.50 = 0.42 µM, for CUPRAC) showed significantly better ABTS, CUPRAC and DPPH radical scavenging ability than quercetin (IC50 = 8.69 µM, for DPPH; IC50 = 15.49 µM, for ABTS.+; and A0.50 = 18.47 µM, for CUPRAC), which is used as a standard. SAR study showed that the synthesized compounds had higher ABTS.+ activity than DPPH and CUPRAC activities. Moreover, the compounds (5c and 5d), containing two hydroxyl groups, exhibited the highest antioxidant activities for all assays. Quantum chemical calculations were also carried out to support SAR results.

Graphical abstract


ABTS Antioxidant activity CUPRAC DPPH Isatin Schiff base 



This work was supported by the Sakarya Research Fund of the Sakarya University (Project Number: 2014-50-01-036).

Compliance with ethical standards

Conflict of interest

The authors declare they have no conflict of interest.

Supplementary material

11030_2018_9910_MOESM1_ESM.pdf (2 mb)
Supplementary material 1 (PDF 2041 kb)


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Fatih Sonmez
    • 1
  • Zuhal Gunesli
    • 1
  • Belma Zengin Kurt
    • 2
  • Isil Gazioglu
    • 3
  • Davut Avci
    • 4
  • Mustafa Kucukislamoglu
    • 5
  1. 1.Pamukova Vocational High SchoolSakarya University of Applied SciencesSakaryaTurkey
  2. 2.Department of Pharmaceutical Chemistry, Faculty of PharmacyBezmialem Vakif UniversityIstanbulTurkey
  3. 3.Department of Analytical Chemistry, Faculty of PharmacyBezmialem Vakif UniversityIstanbulTurkey
  4. 4.Department of PhysicsSakarya UniversitySakaryaTurkey
  5. 5.Department of ChemistrySakarya UniversitySakaryaTurkey

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