Further investigation of the neutral fraction of the methanolic extract of Sindora sumatrana MIQ. (Leguminosae) has yielded five new sesquiterpenoids : a new trans-isodaucane diol (1), two caryophyllane-type epoxydiols (2, 3), the diacetate of a caryophyllane-type trialcohol (4) and a caryolane-type hydroxy-ketone (5) which possesses an α-C-12 methano bridge. The structure elucidation of the compounds was based mainly on two-dimensional NMR techniques. The biosynthetic significance of the acid-catalyzed rearrangement of 5 to give a clovane-type hydroxyketone (10) is also discussed.
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Heymann et al. (1994) studied this question.
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