1-1-diphenyl-2-picrylhydrazyl and erysotramidine

A new Erythrina alkaloid, 10-hydroxy-11-oxoerysotrine (1), has been isolated from the flowers of Erythrina herbacea together with five known compounds: erytharbine (2), 10,11-dioxoerysotrine (3), erythrartine (4), erysotramidine (5) and erysotrine-N-oxide (6). The structure of the new compound was elucidated on the basis of its spectral data, including 2-D NMR and mass (MS) spectra. The new compound is a rare C-10 oxygenated Erythrina alkaloid. The antioxidant activities of the isolated compounds 1-6 were evaluated by scavenging with peroxynitrite.

Topics: Alkaloids; Antioxidants; Biphenyl Compounds; Chromatography, Gel; Erythrina; Flowers; Free Radical Scavengers; Heterocyclic Compounds, 4 or More Rings; Magnetic Resonance Spectroscopy; Mass Spectrometry; Peroxynitrous Acid; Picrates; Plant Extracts; Spectrometry, Mass, Electrospray Ionization