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-β-
D-glucopyranosyl(1→4)-α-
L-rhamnopyranosyl(1→3)-β-
D-glucopyranoside (7), and an acylated oligosaccharide β-
D-glucopyranosyl(1→4)-α-
L-rhamnopyranosyl-(1→3)-(4-
O-
trans-caffeoyl)-
D-glucopyranose) (8), from the aqueous extract of
Boschniakia rossica (C
HAM.
et S
CHLECH.) F
EDTSCH.
et F
LEROV. Spectroscopic evidence led to the assignments of their structures as
trans-
p-coumaryl-(6′-
O-β-
D-xylopyranosyl)-
O-β-
D-glucopyranoside (1),
trans-
p-coumaryl-(6′-
O-α-
L-arabinopyranosyl)-
O-β-
D-glucopyranoside (2) and 2-(3,4-dihydroxyphenyl)-
R,
S-2-ethoxy-ethyl-
O-β-
D-glucopyranosyl(1→4)-α-
L-rhamnopyranosyl(1→3)(4-
O-
trans-caffeoyl)-β-
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.
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