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Instituto de Higiene e Medicina Tropical

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O'Neill PM

Novel endoperoxide-based transmission-blocking antimalarials with liver- and blood-schizontocidal activities

In a search for effective compounds against both the blood- and liver-stages of infection by malaria parasites with the ability to block the transmission of the disease to mosquito vectors, a series of hybrid compounds combining either a 1,2,4-trioxane or 1,2,4,5-tetraoxane and 8-aminoquinoline moieties were synthesized and screened for their antimalarial activity.
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The quinolone-hydroxyquinoline tautomerism in quinolone 3-esters; preserving the 4-oxoquinoline structure to retain antimalarials activity

Recent publications report in vitro activity of quinolone 3-esters against the bc1 protein complex of Plasmodium falciparum and the parasite. Docking studies performed in silico at the yeast Qo site established a key role for the 4-oxo and N–H groups in drug-target interactions. Thus, the possibility of 4-oxoquinoline/4-hydroxyquinoline tautomerism may impact in pharmacologic profiles and should be investigated.
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