Novel acylkaempferol glycoside from the endemic species, Vernonia travancorica Hook. f.
Vernonia travancorica Hook. f. is a taxon, endemic to the evergreen forests of Western Ghats (above 1000 m), India. From the aqueous EtOH extract of the air-dried corymbose inflorescence a novel secondary metabolite, 3-O-beta-[beta-(6'''-acetyl)-D-glucopyranosyl(1-->2)]-D-glucopyranosyl kaempferol (1), has been isolated, together with three other compounds, viz., 4'-methoxykaempferol (2), its 3-O-beta-D-glucopyranoside (3) and kaempferol (4). The structure of the new natural product has been established based on chemical analysis, including characteristic colour reactions, rigorous hydrolytic procedures involving acid, alkali and enzyme, as well as spectral (UV, (1)H and (13)C NMR and FABMS) evidences.
Seetharaman
T R
TR
Department of Chemistry, Kanchi Mamunivar Centre for Post-Graduate Studies, Pondicherry, India.
Petrus
A J A
AJ
D006027:Glycosides; D044949:Kaempferols / Q000737:chemistry / Q000302:isolation & purification; D015394:Molecular Structure; D035741:Vernonia / Q000737:chemistry*
C498944:3-O-beta-(beta-(6'''-acetyl)-D-glucopyranosyl(1-2))-D-glucopyranosyl kaempferol; D006027:Glycosides; D044949:Kaempferols