Oleanane-type triterpenes from Viburnum awabuki

摘要

Three new oleanane-type triterpenes have been isolated from the wood of Viburnum awabuki. Their structures have been elucidated as 3 beta,28-dihydroxy-12-oleanene-1-one, 3 beta,28-dihydroxy-12-oleanene-11-one and 13,28-epoxy-11-oleanene-3-one, respectively, by extensive analysis of spectroscopic data including comparison of C-13 NMR data with those of erythrodiol and some chemical transformations. The structure of 1-oxo-erythrodiol has been confirmed by X-ray crystallographic analysis. (