Issue 3, 2013

Watsonianone A–C, anti-plasmodial β-triketones from the Australian tree, Corymbia watsoniana

Abstract

Three new β-triketones, watsonianones A–C, and the known compound corymbone B were isolated from the flowers of the Australian eucalypt Corymbia watsoniana. Watsonianone A is the first naturally occurring methylene bridged bis-tetramethylcyclohexatrione, watsonianone B is only the fourth fused bisfurano β-triketone and watsonianone C is the first 4,4a,9,9a-tetrahydro-2H-xanthene-1,3,5,7(6H,8H)-tetraone to be reported in the literature. MS and NMR analysis established the structures of the new compounds. All three new compounds showed anti-plasmodial activity against chloroquine resistant (Dd2) and sensitive strains (3D7) of the parasite, Plasmodium falciparum, responsible for malarial infections. Watsonianone B was the most potent inhibitor (IC50 0.289 μM vs. Pf 3D7) demonstrating significant selectivity against the human cell line, HEK 293 (>400 ×). Stage specificity studies indicate that watsonianone B is predominantly active against young ring stages of P. falciparum.

Graphical abstract: Watsonianone A–C, anti-plasmodial β-triketones from the Australian tree, Corymbia watsoniana

Supplementary files

Article information

Article type
Paper
Submitted
02 Oct 2012
Accepted
22 Nov 2012
First published
22 Nov 2012

Org. Biomol. Chem., 2013,11, 453-458

Watsonianone A–C, anti-plasmodial β-triketones from the Australian tree, Corymbia watsoniana

A. R. Carroll, V. M. Avery, S. Duffy, P. I. Forster and G. P. Guymer, Org. Biomol. Chem., 2013, 11, 453 DOI: 10.1039/C2OB26931G

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