Prenylated flavonoids, monoterpenoid furanocoumarins and other constituents from the twigs of Dorstenia elliptica (Moraceae)

A new prenylated flavonoid and two monoterpenoid substituted coumarins were identified from the twigs of Dorstenia elliptica (Moraceae) A monoprenylated flavan and two monoterpenoid substituted furanocoumarins were isolated from the twigs of Dorstenia e lliptica along with 3-(3,3-dimethylallyl)-4,2′,4′-trihydroxylchalcone, psoralen, bergapten, O-[3-(2,2-dimethyl-3-oxo-2 H-furan-5-yl)butyl]bergaptol, β-sitosterol and its β- d-glucopyranoside. The structure of the flavan was determined as 6(1,1-dimethylallyl)-7,4′-dihydroxylflavan and the monoterpenoid substituted furanocoumarins were assigned as O-[3-(2,2-dimethyl-3-oxo-2 H-furan-5-yl)-3-hydroxybutyl]-bergaptol and O-[2-(5-hydroxy-2,6,6-trimethyl-3-oxo-2 H-pyran-2-yl)ethyl]bergaptol, respectively, using spectroscopic analysis, especially, 2D NMR spectra.