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BY-NC-ND 3.0 license Open Access Published by De Gruyter Open Access September 7, 2015

2-Amino-4-arylthiazole Derivatives as Anti-giardial Agents: Synthesis, Biological Evaluation and QSAR Studies

Raul Mocelo-Castell , Carlos Villanueva-Novelo , David Cáceres-Castillo , Ruben M. Carballo , Ramiro F. Quijano-Quiñones , Mariana Quesadas-Rojas , Zulema Cantillo-Ciau , Roberto Cedillo-Rivera , Rosa E. Moo-Puc , Laila M. Moujir and Gonzalo J. Mena-Rejón
From the journal Open Chemistry


A series of seven 2-amino-4-arylthiazoles were prepared following Hantzsch’s modified method under microwave irradiation. A set of 50 derivatives was obtained and the in vitro activity against Giardia intestinalis was evaluated. The results on the biological activity revealed that, in general, the N-(5-bromo-4-aryl-thiazol-2-yl)-acetamide scaffold showed high bioactivity. In particular, compounds 6e (IC50 = 0.39 μM) and 6b (IC50 = 0.87 μM) were found to be more potent than the positive control metronidazole. Citoxicity and acute toxicity tests performed showed low toxicity and high selectivity of the most active compounds (6e SI = 139, 6b SI = 52.3). A QSAR analysis was applied to a data set of 37 obtained 2-amino-4-arylthiazoles derivatives and the best model described a strongly correlation between the anti-giardiasic activity and molecular descriptors as E2M, RDF115m, F10, MATS6v, and Hypnotic-80, with high statistical quality. This finding indicates that N-substituted aminothiazole scaffold should be investigated for the development of highly selective anti-giardial agent.

Graphical Abstract


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Received: 2014-11-4
Accepted: 2015-6-20
Published Online: 2015-9-7

© 2015 Raul Mocelo-Castell et al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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