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Medicinal Chemistry

Author(s): Jessica V. Faria*, Fernanda P.Z. Passos, Paulo H.A. da Costa, Andressa P. de Oliveira, Yasmin O.D. da Cruz, Frederico S. Castelo-Branco, Maria C.S. Lourenço, Silvane M.F. Murta, Policarpo A.S. Junior, Alice M.R. Bernardino, Monica M. Bastos and Nubia Boechat*

DOI: 10.2174/1573406418666211116144952

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Novel 2-Nitroimidazole and Imidazooxazole Derivatives and their Activity against Trypanosoma cruzi and Mycobacterium tuberculosis

Page: [701 - 709] Pages: 9

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Abstract

Background: Tuberculosis (TB) is one of the top ten causes of death worldwide, while Chagas disease (CD) is the parasitic disease that kills the largest number of people in the Americas. TB is the leading cause of death for patients with AIDS; it kills 1.5 million people and causes 10 million new cases every year. The lack of newly developed chemotherapeutic agents and insufficient access to health care services for a diagnosis increase the incidence of multidrug-resistant TB (MDRTB) cases. Although CD was identified in 1909, the chronic stages of the disease still lack adequate treatment.

Objective: The purpose of this work was to design and synthesize two new series of 2-nitroimidazole 5a-e and imidazooxazoles 6a-e with 1H-1,2,3-triazolil nucleus and evaluate their activities against Tc and Mycobacterium tuberculosis (Mtb).

Methods: Two series of five compounds were synthesized in a 3 or 4-step route in moderated yields, and their structures were confirmed by NMR spectral data analyses. The in vitro antitrypanosomal evaluation of products was carried out in an intracellular model using L929 cell line infected with trypomastigotes and amastigote forms of Tc of β-galactosidase-transfected Tulahuen strain. Their antimycobacterial activity was evaluated against Mtb strain H37Rv.

Results: In general, 2-nitroimidazolic derivatives proved to be more potent in regard to antitrypanocidal and antimycobacterial activity. The non-cytotoxic 2-nitroimidazole derivative 5b was the most promising with a half maximum inhibitory concentration of 3.2 μM against Tc and a minimum inhibitory concentration of 65.3 μM against Mtb.

Conclusion: Our study reinforced the importance of 2-nitroimidazole and 1H-1,2,3-triazole nuclei in antimicrobial activity. In addition, derivative 5b proved to be the most promising, presenting important activity against Tc and Mtb and could be used as a starting point for the development of new agents against these diseases.

Keywords: Chagas disease, tuberculosis, nitroimidazole, 1H-1, 2, 3-triazole, imidazooxazole, Trypanosoma cruzi, Mycobacterium tuberculosis.

Graphical Abstract

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