New Flavonoids of the Genus Scutellaria. II. Baicalein and Wogonin Glycosides from S. baicalensis

Abstract

New glycosides of baicalein (1–4) and wogonin (5 and 6) were found by studying phenolic compounds from roots of Scutellaria baicalensis Georgi (Lamiaceae) grown with treatment by 24-epibrassinolide. The new compounds were baicalein 7-O-(2′′-O-β-D-glucosyl)-β-D-glucuronopyranoside (scutellariside III, 1), baicalein 6-O-β-D-glucopyranoside-7-O-(2′′-O-β-D-glucosyl)-β-D-glucoronopyranoside (scutellariside IV, 2), baicalein 6-O-β-D-glycopyranosyl-7-O-β-D-glucuronopyranoside (scutellariside V, 3), baicalein 7-O-(2′′-O-malonyl)-β-D-glucuronopyranoside (scutellariside VI, 4), wogonin 7-O-(2′′-O-β-D-glucosyl)-β-D-glucuronopyranoside (scutellariside VII, 5), and wogonin 7-O-(2′′-O-malonyl)-β-D-glucuronopyranoside (scutellariside VIII, 5) according to UV and NMR spectroscopic and mass spectrometric data.