Structures of eight new triterpenoids and isolation of other triterpenoids and epi-ikshusterol from the stems of Lithocarpus cornea

Abstract

Eight new triterpenoids from the light petroleum extract of the stems of Lithocarpus cornea(Lour.) Rhed. have been proved to be taraxer-14-ene-3β,29-diol (VIII) and its diacetate (VII), 29-hydroxytaraxer-14-en-3-one (X) and its acetate (IX), 14α-hydroxytaraxeran-3-one (XXIX), taraxerane-3β,14α-diol (XXX), 22-hydroxy-21αH-hopan-3-one (XXIII), and lup-20(29)-ene-3β,27-diol (XXXII). Other triterpenoids isolated from the same extract, besides those already reported ¹ were lupeol, betulin, and myricadiol (I). The steroid epi-ikshusterol (stigmast-5-ene-3β,7β-diol)(XXXVII) was also obtained.