Studies on Unutilized Resource. IV. Flavonoids in the Leaves of Sorbaria stellipila SCHNEID (Rosaceae)

Abstract

The fresh leaves of Sorbaria stellipila SCHNEID (S. sorbifolia A. Br. var. stellipila MAXIM.) was extracted with methanol and the methanolic extract was extracted with ethyl acetate. The ethyl acetate extract afforded sorbarin (scutellarein-7-monorhamnoside) and a new flavonoide (I) as yellow needles, mp 290-292°. I corresponded to the molecular formula of C16H12O6. Complete ethyl ether of I was identified as 7-methoxy-, 5, 6, 4'-triethoxyflavone by direct comparison with the authentic sample, which was produced from sorbarin. Consequently, I was determined as scutellarein-7-methyl ether (5, 6, 4'-trihydroxy-7-methoxyflavone), and named sorbifolin.