© Georg Thieme Verlag Stuttgart · New York
Iridoid Glucosides from Penstemon nitidus
05 January 2007 (online)
From the leaves of Penstemon nitidus Dougl. (smooth blue beardtongue) besides the known iridoid glucosides cornin (syn. verbenalin), hastatoside and β-dihydrohastatoside the new compound 10-hydroxycornin has been isolated. The structures of all compounds were established by spectroscopic means (FD-MS, 1H-, 13C-, 2D-NMR, and NOE). This is the first report of cornin and analogous 6-keto iridoids in scrophulariaceous plants. Up to now iridoid glucosides like these have only been found in plants belonging to the Cornaceae and its allies and to the Lamiaceae-Verbenaceae complex.
Penstemon nitidus - Scrophulariaceae - iridoid glucosides - cornin - hastatoside - β-dihydrohastatoside - 10-hydroxycornin - structure elucidation