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Klaivanolide, an antiprotozoal lactone from Uvaria klaineana
Blandine Akendengue1, François Roblot, Philippe M Loiseau
1Département de Chimie-Biochimie, Faculté de Médecine et des Sciences de la Santé, B.P. 4009, Libreville, Gabon.
Abstract:
Bioguided-fractionation of a CH(2)Cl(2) extract of the stems of Uvaria klaineana (Annonaceae) led to isolation of klaivanolide, a novel bisunsaturated 7-membered lactone (5-acetoxy-7-benzoyloxymethyl-7H-oxepin-2-one), together with benzyl benzoate. Klaivanolide showed potent in vitro antileishmanial activity against both sensitive and amphotericin B-resistant promastigote forms of Leishmania donovani with IC(50) values of 1.75 and 3.12 microM, respectively. The compound also showed in vitro trypanocidal activity against trypomastigote forms of Trypanosoma brucei brucei GVR 35. Its structure was established by 1D and 2D NMR and other spectroscopic techniques.