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Molecules 2012, 17(7), 8285-8302; doi:10.3390/molecules17078285
Article

New Trifluoromethyl Triazolopyrimidines as Anti-Plasmodium falciparum Agents

1,* , 1, 1,2, 3,4, 1, 1, 1, 5, 2, 1, 1,5, 5, 1, 3 and 3,4
Received: 31 May 2012; in revised form: 27 June 2012 / Accepted: 29 June 2012 / Published: 10 July 2012
(This article belongs to the Section Medicinal Chemistry)
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Abstract: According to the World Health Organization, half of the World’s population, approximately 3.3 billion people, is at risk for developing malaria. Nearly 700,000 deaths each year are associated with the disease. Control of the disease in humans still relies on chemotherapy. Drug resistance is a limiting factor, and the search for new drugs is important. We have designed and synthesized new 2-(trifluoromethyl)[1,2,4]triazolo[1,5-a]pyrimidine derivatives based on bioisosteric replacement of functional groups on the anti-malarial compounds mefloquine and amodiaquine. This approach enabled us to investigate the impact of: (i) ring bioisosteric replacement; (ii) a CF3 group substituted at the 2-position of the [1,2,4]triazolo[1,5-a]pyrimidine scaffold and (iii) a range of amines as substituents at the 7-position of the of heterocyclic ring; on in vitro activity against Plasmodium falciparum. According to docking simulations, the synthesized compounds are able to interact with P. falciparum dihydroorotate dehydrogenase (PfDHODH) through strong hydrogen bonds. The presence of a trifluoromethyl group at the 2-position of the [1,2,4]triazolo[1,5-a]pyrimidine ring led to increased drug activity. Thirteen compounds were found to be active, with IC50 values ranging from 0.023 to 20 µM in the anti-HRP2 and hypoxanthine assays. The selectivity index (SI) of the most active derivatives 5, 8, 11 and 16 was found to vary from 1,003 to 18,478.
Keywords: triazolopyrimidine; trifluoromethyl; malaria; P. falciparum; PfDHODH triazolopyrimidine; trifluoromethyl; malaria; P. falciparum; PfDHODH
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Boechat, N.; Pinheiro, L.C.S.; Silva, T.S.; Aguiar, A.C.C.; Carvalho, A.S.; Bastos, M.M.; Costa, C.C.P.; Pinheiro, S.; Pinto, A.C.; Mendonça, J.S.; Dutra, K.D.B.; Valverde, A.L.; Santos-Filho, O.A.; Ceravolo, I.P.; Krettli, A.U. New Trifluoromethyl Triazolopyrimidines as Anti-Plasmodium falciparum Agents. Molecules 2012, 17, 8285-8302.

AMA Style

Boechat N, Pinheiro LCS, Silva TS, Aguiar ACC, Carvalho AS, Bastos MM, Costa CCP, Pinheiro S, Pinto AC, Mendonça JS, Dutra KDB, Valverde AL, Santos-Filho OA, Ceravolo IP, Krettli AU. New Trifluoromethyl Triazolopyrimidines as Anti-Plasmodium falciparum Agents. Molecules. 2012; 17(7):8285-8302.

Chicago/Turabian Style

Boechat, Núbia; Pinheiro, Luiz C. S.; Silva, Thiago S.; Aguiar, Anna C. C.; Carvalho, Alcione S.; Bastos, Monica M.; Costa, Carolina C. P.; Pinheiro, Sergio; Pinto, Angelo C.; Mendonça, Jorge S.; Dutra, Karen D. B.; Valverde, Alessandra L.; Santos-Filho, Osvaldo A.; Ceravolo, Isabela P.; Krettli, Antoniana U. 2012. "New Trifluoromethyl Triazolopyrimidines as Anti-Plasmodium falciparum Agents." Molecules 17, no. 7: 8285-8302.


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