Antimalarial sulfide, sulfone, and sulfonamide trioxanes
摘要:
A series of trioxanes featuring sulfide, sulfone. and sulfonamide snbstituents in diverse positions has been prepared. Structure-activity relationship (SAR) generalizations highlight two major factors controlling the antimalarial potency of these new chemical entities: (1) the proximity of the sulfur-containing substituent to the crucial peroxide bond and (2) the oxidation stale of the sulfur-containing substituent. Generally, sulfones are more antimalarially potent than the corresponding sulfides. (C) 2000 Elsevier Science Ltd. All rights reserved.
Antimalarial Simplified 3-Aryltrioxanes: Synthesis and Preclinical Efficacy/Toxicity Testing in Rodents
摘要:
A streamlined five-step chemical synthesis of rationally designed, simplified 3-aryltrioxane 8a is described. A noteworthy feature of this synthetic scheme is use of air rather than expensive molecular oxygen as the source of the pharmacologically critical peroxide unit in trioxane 8a. This simplified acetal trioxane carboxylic acid 8a is thermally stable, and it is hydrolytically stable in water even at 40 degreesC and pH 7.4 for at least 7 days. Preclinical evaluation of this water-soluble synthetic trioxane 8a in rodents shows it to have at least as good a therapeutic index (efficacy/toxicity) as that of water-soluble semisynthetic trioxane artelinic acid (5).