New prenylated dihydrostilbenes from croton laevifolius

Abstract

Two prenylated dihydrostilbenes have been isolated from the methanol extract of the flower of Croton laevifolius. The structures of these compounds were assigned as 3,5,3',4'-tetrahydroxy-2,6,2'-tris(3-methylbut-2-enyl) dihydrostilbene (laevifolin A) and 3,5,3',4'-tetrahydroxy-2,6,5' -tris(3-methylbut-2-enyl)dihydrostilbene (laevifolin B) based on spectroscopic evidence, including UV, IR, 1D and 2D NMR, and mass spectra. The chemotaxonomic significance of the presence of these dihydrostilbene derivatives is briefly discussed.