Components of Broussonetia papyrifera (L.) VENT. III. : Structures of Two New Isoprenylated Flavonols, Brossoflavonols C and D

Abstract

Two new isoprenylated flavonols, named brossoflavonols C (1) and D (2), were isolated from the extract of the root bark of Brossonetia papyrifera (L.) VENT. (Japanese name "Kazinoki", Moracese). The structures of brossoflavonols C and D were shown to be 1 and 2, respectively, on the basis of spectral evidence. The compounds (1 and 2) are the first reported examples of triakenyl flavonols.