Abstract
A new friedelane type triterpene, 3,16-dioxo-12α-hydroxyfriedelane was isolated from the chloroform extract of branches of Maytenus gonoclada Martius (Celastraceae) together with nine known compounds: 3, 11-dioxofriedelane, 3, 16-dioxofriedelane, 3, 12-dioxofriedelane, 3-oxo-12α,29-dihydroxyfriedelane, 3-oxofriedelane (friedelin), 3β-hydroxyfriedelane, 3-oxo-12α-hydroxyfriedelane and 3β-hydroxylup-20(29)-ene (lupeol) and a mixture of long chain hydrocarbons. The structure and stereochemistry of the new friedelane triterpene were established from the 1H NMR and 13C NMR spectra including two-dimensional experiments (HSQC, HMBC and NOESY) and high resolution mass spectrometry.
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