New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium</em> <em>falciparum</em> Agents
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 limiti...
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doaj-3a72c6a03e3b4834b73c1620194ea6212020-11-24T21:10:39ZengMDPI AGMolecules1420-30492012-07-011778285830210.3390/molecules17078285New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium</em> <em>falciparum</em> AgentsNúbia BoechatLuiz C. S. PinheiroThiago S. SilvaAnna C. C. AguiarAlcione S. CarvalhoMonica M. BastosCarolina C. P. CostaSergio PinheiroAngelo C. PintoJorge S. MendonçaKaren D. B. DutraAlessandra L. ValverdeOsvaldo A. Santos-FilhoIsabela P. CeravoloAntoniana U. KrettliAccording 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-<em>a</em>]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 CF<sub>3</sub> group substituted at the 2-position of the [1,2,4]triazolo[1,5-<em>a</em>]pyrimidine scaffold and (iii) a range of amines as substituents at the 7-position of the of heterocyclic ring; on <em>in vitro</em> activity against <em>Plasmodium falciparum</em>. According to docking simulations, the synthesized compounds are able to interact with <em>P. falciparum</em> dihydroorotate dehydrogenase (<em>Pf</em>DHODH) through strong hydrogen bonds. The presence of a trifluoromethyl group at the 2-position of the [1,2,4]triazolo[1,5-<em>a</em>]pyrimidine ring led to increased drug activity. Thirteen compounds were found to be active, with IC<sub>50</sub> values ranging from 0.023 to 20 µM in the anti-HRP2 and hypoxanthine assays. The selectivity index (SI) of the most active derivatives <strong>5</strong>, <strong>8</strong>, <strong>11</strong> and <strong>16</strong> was found to vary from 1,003 to 18,478.http://www.mdpi.com/1420-3049/17/7/8285triazolopyrimidinetrifluoromethylmalaria<em>P. falciparum</em><em>Pf</em>DHODH |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Núbia Boechat Luiz C. S. Pinheiro Thiago S. Silva Anna C. C. Aguiar Alcione S. Carvalho Monica M. Bastos Carolina C. P. Costa Sergio Pinheiro Angelo C. Pinto Jorge S. Mendonça Karen D. B. Dutra Alessandra L. Valverde Osvaldo A. Santos-Filho Isabela P. Ceravolo Antoniana U. Krettli |
spellingShingle |
Núbia Boechat Luiz C. S. Pinheiro Thiago S. Silva Anna C. C. Aguiar Alcione S. Carvalho Monica M. Bastos Carolina C. P. Costa Sergio Pinheiro Angelo C. Pinto Jorge S. Mendonça Karen D. B. Dutra Alessandra L. Valverde Osvaldo A. Santos-Filho Isabela P. Ceravolo Antoniana U. Krettli New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium</em> <em>falciparum</em> Agents Molecules triazolopyrimidine trifluoromethyl malaria <em>P. falciparum</em> <em>Pf</em>DHODH |
author_facet |
Núbia Boechat Luiz C. S. Pinheiro Thiago S. Silva Anna C. C. Aguiar Alcione S. Carvalho Monica M. Bastos Carolina C. P. Costa Sergio Pinheiro Angelo C. Pinto Jorge S. Mendonça Karen D. B. Dutra Alessandra L. Valverde Osvaldo A. Santos-Filho Isabela P. Ceravolo Antoniana U. Krettli |
author_sort |
Núbia Boechat |
title |
New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium</em> <em>falciparum</em> Agents |
title_short |
New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium</em> <em>falciparum</em> Agents |
title_full |
New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium</em> <em>falciparum</em> Agents |
title_fullStr |
New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium</em> <em>falciparum</em> Agents |
title_full_unstemmed |
New Trifluoromethyl Triazolopyrimidines as Anti-<em>Plasmodium</em> <em>falciparum</em> Agents |
title_sort |
new trifluoromethyl triazolopyrimidines as anti-<em>plasmodium</em> <em>falciparum</em> agents |
publisher |
MDPI AG |
series |
Molecules |
issn |
1420-3049 |
publishDate |
2012-07-01 |
description |
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-<em>a</em>]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 CF<sub>3</sub> group substituted at the 2-position of the [1,2,4]triazolo[1,5-<em>a</em>]pyrimidine scaffold and (iii) a range of amines as substituents at the 7-position of the of heterocyclic ring; on <em>in vitro</em> activity against <em>Plasmodium falciparum</em>. According to docking simulations, the synthesized compounds are able to interact with <em>P. falciparum</em> dihydroorotate dehydrogenase (<em>Pf</em>DHODH) through strong hydrogen bonds. The presence of a trifluoromethyl group at the 2-position of the [1,2,4]triazolo[1,5-<em>a</em>]pyrimidine ring led to increased drug activity. Thirteen compounds were found to be active, with IC<sub>50</sub> values ranging from 0.023 to 20 µM in the anti-HRP2 and hypoxanthine assays. The selectivity index (SI) of the most active derivatives <strong>5</strong>, <strong>8</strong>, <strong>11</strong> and <strong>16</strong> was found to vary from 1,003 to 18,478. |
topic |
triazolopyrimidine trifluoromethyl malaria <em>P. falciparum</em> <em>Pf</em>DHODH |
url |
http://www.mdpi.com/1420-3049/17/7/8285 |
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