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Current Organic Synthesis

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ISSN (Print): 1570-1794
ISSN (Online): 1875-6271

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Short Communication

Synthesis by Microwave Irradiation, Molecular Structural Analysis and Trypanocidal Activity of Novel Pyrazole-tetrahydropyrimidine Derivatives

Author(s): Cynthia Nathalia Pereira, Júlia Akihoshi de Oliveira, Leonardo da Silva Lara, Lorraine Martins Rocha Orlando, Mirian Claudia de Souza Pereira and Maurício Silva dos Santos*

Volume 20, Issue 7, 2023

Published on: 06 March, 2023

Page: [707 - 715] Pages: 9

DOI: 10.2174/1570179420666230110161122

Price: $65

Abstract

Background: A series of new eight 2-(1-aryl-3-methyl-1H-pyrazol-4-yl)-1,4,5,6-tetrahydropyrimidines 1(a-h) were synthesized by microwave irradiation technique. In vitro phenotypic screening was performed to evaluate the effect of these compounds on intracellular amastigotes forms of Trypanosoma cruzi, the etiological agent of Chagas disease.

Methods: Compounds 1(a-h) were synthesized from pyrazole-carbonitriles 2(a-h) employing microwave irradiation (50W) for 10-20 minutes. Physicochemical properties were calculated using OSIRIS DataWarrior. The toxic effect on mammalian cells (Vero Cells) and the trypanocidal activity against Trypanosoma cruzi (Dm28c-Luc) were also evaluated.

Results: Compounds 1(a-h) were obtained in 24-94% yields. They were completely characterized by Fourier Transform Infrared (FT-IR), Nuclear Magnetic Resonance (NMR) and High-Resolution Mass Spectrometry (HRMS) analyses. The derivatives showed low trypanocidal activity, with IC50 ranging from 47.16 to > 100 μM, with lower activity than benznidazole (1.93 μM) used as reference drug.

Conclusion: The attractive features of this synthetic methodology are mild conditions, short reaction time, and low power. All derivatives showed low toxicity in mammalian cells, good oral bioavailability, and did not violate Lipinski´s rule of 5.

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Graphical Abstract

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