Enhancement of the antiplasmodial activity of quassin by transformation into a gamma-lactone.
Wright, Colin W. Kirby, G.C Phillipson, J.D Warhurst, D.C. Lang'at-Thoruwa, C. Watt, R.A.
Wright, Colin W.
Kirby, G.C
Phillipson, J.D
Warhurst, D.C.
Lang'at-Thoruwa, C.
Watt, R.A.
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2003
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Abstract
The naturally occurring bitter principle quassin (1) was converted chemically into the gamma-lactone quassilactone (13) in an attempt to enhance its antiplasmodial activity. The in vitro antiplasmodial activity of 13 against Plasmodium falciparum (K1) (IC(50) = 23 microM) was 40-fold greater than that of 1. However, one of the intermediates, compound 8, the 15beta-hydroxy,16-O-m-chlorobenzoyl analogue of 1, was 506-fold more active than 1 against P. falciparum (IC(50) = 1.8 microM) and only 3-fold less potent than chloroquine. In addition, 8 displayed the best cytotoxic/antiplasmodial ratio (112) of all of the compounds tested. In the course of this work a dimer, neoquassin ether (6), linked at C-16 was also prepared; 6 was found to have weak antiplasmodial activity (IC(50) = 9.7 microM).
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Wright, C., kirby, G.C., Phillipson, J.D. and Warhurst, D.C. et al. (2003). Enhancement of the antiplasmodial activity of quassin by transformation into a gamma-lactone. Journal of Natural Products. Vol. 66, No. 11, pp. 1486-1489.
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