New Acylated Flavone-O-Glycosides and Iridoids from the Genus Veronica

Six new compounds including four flavonoids (1-3, 5) and two iridoids (4 and 6) were found in three Veronica species growing in eastern Siberia. Their structures were studied by UV and NMR spectroscopy and mass spectrometry. 6-Hydroxyluteolin-7-O-(6 ''-O-isoferuloyl)-beta-D-glucopyranoside (veroniside A, 1) was isolated from V. daurica Steven; 6-hydroxyluteolin-7-O-(6 ''-O-isovanilloyl)-beta-D-glucopyranoside (veroniside B, 2) and scutellarein-7-O-(6 ''-O-vanilloyl)-beta-D-glucopyranoside (veroniside C, 3), from V. spicata subsp. incana (L.) Walters (V. incana L.); and 6-O-sinapoyl catalpol (veroniside D, 4), scutellarein-7-O-(6 ''-O-protocatechoyl)glucoside (veroniside E, 5), and 6-O-isoferuloyl asystasioside E (veroniside F, 6), from V. longifolia L.

Automated summary

Six new compounds, including four flavonoids and two iridoids, were identified in three Veronica species from eastern Siberia. The structures of these compounds were elucidated using UV, NMR spectroscopy, and mass spectrometry techniques.