Abstract
Maytenus nemerosa has been fractionated systematically by following the toxicity of extracts, partitioned solutions and column chromatographic fractions against cultured KB cells. Several compounds were isolated in this fashion, including 3-oxo-20(29)-lupen-30-al, β-amyrin, 29-hydroxyfriedelan-3-one, 30-hydroxy-20(29)-lupen-3-one, 30-hydroxyfriedelan-3-one and lup-20(29)-ene-3β,30-diol, as well as tingenone, 20-hydroxytingenone and galactitol. 3-Oxo-20(29)-lupen-30-al was shown to be cytotoxic for the first time; the structural basis of this cytotoxicity was investigated, in part, by bioassay of four products obtained by chemical transformation of single, isolated principles.
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