title: Rossicasins A, B and rosicaside F, three new phenylpropanoid glycosides from Boschniakia rossica.
abstract: Three phenylpropanoid glycosides have been isolated, together with the known phenylpropanoid glycosides rossicaside A (4), B (5), E (6), and trans-p-coumaryl alcohol 1-O-beta-D-glucopyranosyl(1-->4)-alpha-L-rhamnopyranosyl(1-->3)-beta-D-glucopyranoside (7), and an acylated oligosaccharide beta-D-glucopyranosyl(1-->4)-alpha-L-rhamnopyranosyl-(1-->3)-(4-O-trans-caffeoyl)-D-glucopyranose) (8), from the aqueous extract of Boschniakia rossica (CHAM. et SCHLECH.) FEDTSCH. et FLEROV. Spectroscopic evidence led to the assignments of their structures as trans-p-coumaryl-(6'-O-beta-D-xylopyranosyl)-O-beta-D-glucopyranoside (1), trans-p-coumaryl-(6'-O-alpha-L-arabinopyranosyl)-O-beta-D-glucopyranoside (2) and 2-(3,4-dihydroxyphenyl)-R,S-2-ethoxy-ethyl-O-beta-D-glucopyranosyl(1-->4)-alpha-L-rhamnopyranosyl(1-->3)(4-O-trans-caffeoyl)-beta-D-glucopyranoside (3), designated as rossicasin A, rossicasin B, and rossicaside F, respectively. Compound 7 was identified from the degradation reaction and this is the first isolation from a natural source.
authors.affiliation: Department of Anesthesiology, Buddhist Tzu Chi General Hospital, Taipei, Taiwan.
authors.forename: Ming-Hwang
authors.initials: MH
authors.lastname: Shyr
authors.forename: Tung-Hu
authors.initials: TH
authors.lastname: Tsai
authors.forename: Lie-Chwen
authors.initials: LC
authors.lastname: Lin
mesh_terms: D000595:Amino Acid Sequence; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D031670:Orobanchaceae / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013056:Spectrophotometry, Ultraviolet
chemical_list: D006027:Glycosides; D010936:Plant Extracts; C509488:rosicaside F; C509486:rossicasin A; C509487:rossicasin B