Studies on the Constituents of Scutellaria Species. XI. : On the Flavonoid Constituents of the Aerial Parts of Scutellaria indica L

From the aerial parts of Scutellaria indica L., five new chalcones (I-V) were isolated, together with (2S)-5, 6, 7, 2', 3', 4', 5'-heptamethoxyflavanone, scutellarein 7-O-β-D-glucopyranoside, chrysin, apigenin, luteolin, scutellarein, isoscutellarein, chrysin 7-O-glucuronide, apigenin 7-O-glucuronide, scutellarin and isoscutellarein 8-O-glucuronide. The structures of I-V were shown to be 2'-hydroxy-2, 3, 4, 5, 4', 5', 6'-heptamethoxychalcone, 2, 3, 4, 5, 2', 4', 5', 6'-octamethoxychalcone, 2'-hydroxy-2, 3, 4, 5, 6'-pentamethoxy-4', 5'-methylenedioxychalcone, 2, 3, 4, 5, 2', 6'-hexamethoxy-4, 5-methylenedioxychalcone, 2, 2-dihydroxy-3, 4, 5, 6'-tetramethoxy-4', 5'-methylenedioxychalcone, respectively, on the basis of the chemical and spectral data. Compound I has already been synthesized.