Iron-mediated degradation kinetics of substituted dispiro-1,2,4-trioxolane antimalarials

Darren John Creek, William Neil Charman, Francis Chi Keung Chiu, Richard John Prankerd, Kevin J McCullough, Yuxiang Dong, Jonathan Vennerstrom, Susan Ann Charman

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The iron-mediated reactivity of various dispiro-1,2,4-trioxolanes was determined by automated kinetic analyisis under standard reaction conditions. The active antimalarial compounds underwent peroxide bond cleavage by Fe(II) resulting in products indicative of carbon-centered radical formation. The rate of reaction was heavily influenced by the presence of spiro-substituted adamantane and cyclohexane rings, and was also significantly affected by cyclohexane ring substitution. Steric hindrance around the peroxide oxygen atoms appeared to be the major determinant of reaction rate, however polar substituents also affected reactivity by an independent mechanism. A wide range of reaction rates was observed within this class of peroxide antimalarials, however iron-mediated reactivity did not directly correlate with in vitro antimalrial activity.
Original languageEnglish
Pages (from-to)2945 - 2956
Number of pages12
JournalJournal of Pharmaceutical Sciences
Issue number11
Publication statusPublished - 2007

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