Phenylethanoids, iridoids and a spirostanol saponin from Veronica turrilliana.
From the aerial parts of Veronica turrilliana two phenylethanoid glycosides, turrilliosides A and B and a steroidal saponin, turrillianoside were isolated and their structures elucidated as beta-(3,4-dihydroxyphenyl)ethyl-4-O-E-caffeoyl-O-[beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranosyl-(1-->6)]-beta-glucopyranoside, beta-(3,4-dihydroxyphenyl)ethyl-4-O-E-caffeoyl-[6-O-E-feruloyl-beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranosyl-(1-->6)]-beta-glucopyranoside and (23S,25S)-12beta,23-dihydroxyspirost-5-en-3beta-yl O-alpha-rhamnopyranosyl-(1-->4)-beta-glucopyranoside, respectively. Furthermore, eight known glucosides are reported namely, catalpol, catalposide, verproside, amphicoside, isovanilloylcatalpol, aucubin, arbutin, and 6-O-E-caffeoylarbutin, the latter two for the first time in the genus Veronica. The two phenylethanoid glycosides were found to be potent DPPH radical scavengers. All of the tested compounds were inactive against the representative species of fungi and bacteria.
Kostadinova
Emanuela P
EP
Institute of Organic Chemistry with Center of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Alipieva
Kalina I
KI
Kokubun
Tetsuo
T
Taskova
Rilka M
RM
Handjieva
Nedjalka V
NV
D039823:Iridoids / Q000737:chemistry* / Q000302:isolation & purification*; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry* / Q000302:isolation & purification*; D035261:Plant Components, Aerial / Q000737:chemistry; D013150:Spirostans / Q000737:chemistry* / Q000302:isolation & purification*; D032264:Veronica / Q000737:chemistry*
D039823:Iridoids; D010636:Phenols; D013150:Spirostans