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Structure-activity relationships of lactone ring-opened analogs of the antimalarial 1,2,4-trioxane artemisinin.

Journal of Medicinal Chemistry

Structure-Activity Relationship, Animals, Antimalarials, chemistry, pharmacology, Artemisinins, Lactones, Mice, Plasmodium berghei, drug effects, Plasmodium falciparum, Sesquiterpenes

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      Abstract

      1,2,4-Trioxane benzylic ethers 8a-e were prepared as simplified, tricyclic versions of the clinically used tetracyclic antimalarial drug artemisinin (1). Five additional artemisinin analogs (9-11) were prepared. Neither water solubility (analogs 8e and 11b) nor chelating ability (analogs 9 and 10), however, produced trioxanes of especially high in vitro antimalarial activity. Trioxane fluorobenzyl ether 8b is the most active in this series (more active than artemisinin) against Plasmodium falciparum parasites in vitro, with substantial activity also in mice infected with Plasmodium berghei parasites and with 10 times higher activity than artemisinin (1) in killing immature P. falciparum gametocytes.

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