Medicinal Chemistry Research

, Volume 26, Issue 7, pp 1574–1584 | Cite as

Synthesis and antioxidant activity of a new class of pyrazolyl indoles, thiazolyl pyrazolyl indoles

  • Nagarjuna Ummadi
  • Sravya Gundala
  • Padmavathi Venkatapuram
  • Padmaja Adivireddy
Original Research


A new class of bis and tris heterocycles–pyrazolyl indoles and thiazolyl pyrazolyl indoles were prepared from the Michael acceptor (E)-3-(1H-indol-3-yl)-1-arylprop-2-en-1-ones by ultrasound irradiation technique and tested for antioxidant activity. The thiazolyl pyrazolyl indoles and pyrazolyl indoles showed greater radical scavenging activity than pyrazolinyl indoles. Amongst all the tested compounds, 3-(1-(4′′-(p-chlorophenyl)thiazol-2′′-yl)-3′-p-tolyl-1H-pyrazol-5′-yl)-1H-indole (7b) and 3-(1-(4′′-(p-chlorophenyl)thiazol-2′′-yl)-3′-(p-methoxyphenyl)-1H-pyrazol-5′-yl)-1H-indole (7c) displayed promising antioxidant activity when compared with standard drug ascorbic acid. The compounds having electron donating groups (CH3, OCH3) on the phenyl ring exhibited greater antioxidant activity than those with electron withdrawing groups (Cl, Br, NO2).


Indole Pyrazole Thiazole Cyclocondensation Antioxidant activity 



The authors are grateful to University Grants Commission, New Delhi for the sanction of UGC-BSR fellowship. The authors are also thankful to Prof. Ch. Appa Rao, Department of Bio-chemistry (SVU), for providing facilities to carry out the antioxidant activity.

Conflict of interest

The authors declare that they have no competing interests.


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Nagarjuna Ummadi
    • 1
  • Sravya Gundala
    • 1
  • Padmavathi Venkatapuram
    • 1
  • Padmaja Adivireddy
    • 1
  1. 1.Department of ChemistrySri Venkateswara UniversityTirupatiIndia

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