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Squaric acid/4-aminoquinoline conjugates: novel potent antiplasmodial agents
Carlos J A Ribeiro1, S Praveen Kumar, Jiri Gut
1Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon. Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal.
Abstract:
We report the synthesis and structure-activity relationship (SAR) analysis of a series of hybrid compounds containing a squaric moiety conjugated with heterocyclic moieties from well-known antimalarials. This novel series of compounds presents improved antiplasmodial activity compared with the squaric derivatives described in our previous work. Three compounds, 8b (IC₅₀ = 99 nM), 8c (IC₅₀ = 95 nM), and 8d (IC₅₀ = 105 nM) had greater in vitro potency than chloroquine 1 (IC₅₀ = 140 nM) against chloroquine resistant Plasmodium falciparum. In addition, they were noncytotoxic against NIH 3T3 and Hek 293T cells.
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