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Current Bioactive Compounds

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ISSN (Print): 1573-4072
ISSN (Online): 1875-6646

Research Article

Antileishmanial and Antitrypanosomal Activity of Synthesized Hydrazones, Pyrazoles, Pyrazolo[1,5-a]-Pyrimidines and Pyrazolo[3,4-b]- Pyridine

Author(s): Katherine Figarella, Sabrina Marsiccobetre, Ivan Galindo-Castro, Neudo Urdaneta, Julio C. Herrera, Nieves Canudas and Elier Galarraga*

Volume 14 , Issue 3 , 2018

Page: [234 - 239] Pages: 6

DOI: 10.2174/1573407213666170405121810

Price: $65

Abstract

Background: Considering the fact that many nitrogenated aromatic derivatives such as pyrazoles, hydrazones, pyrazolo[1,5-a]-pyrimidines and pyrazolo [3,4-b]-pyridine have shown antiparasitic properties, the current study was carried out to analyze the in vitro antileishmanial and antitrypanosomal potential of some derivatives, synthesize from 6-substituted-3-formylcromone.

Method: The pyrazoles (4a-c), hydrazones (5a-c), pyrazolo[1,5-a]-pyrimidines (6a, 6b) and pyrazolo [3,4-b]-pyridine (7) were prepared by condensation reaction between 6-substituted 3-formylchromones (1a-c) with N-substituted hydrazines (2a-c) and aminopyrazole 3. The synthesized compounds were tested for their in vitro antiparasitic activity against promastigotes of Leishmania mexicana (Bel 21) and epimastigotes of Trypanosoma cruzi (DM28) using a modified MTT assay to determine the compounds IC50 on each parasite strain. The selectivity index (SI) of each compound was also determined by testing the compounds on fibroblasts.

Results: IC50 values of all compounds were between 6 – 89 µM for L. mexicana and 4 – 174 µM for T. cruzi. Hydrazones 5a and 5b exhibited the highest antiparasitic activity against both L. mexicana, with IC50 values of 6.3 µM and 15 µM respectively, and T. cruzi, with IC50 4.1 µM and 10 µM and were 2 to 5 times more active on these parasites than on fibroblasts.

Conclusion: These results suggest that compound 5a is a suitable candidate for further development of molecules with antileishmanial and antitrypanosomal activity.

Keywords: Antileishmanial, antitrypanosomal, hydrazones, pyrazolo[1, 5-a]-pyrimidines, pyrazolo[3, 4-b]-pyridines, 6- substituted-3-formylchromones.

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