Chemical and Pharmaceutical Bulletin
Online ISSN : 1347-5223
Print ISSN : 0009-2363
ISSN-L : 0009-2363
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Five New Phenylethanoid Glycosides from the Whole Plants of Lamium purpureum L.
Nanoko ItoTamotsu NiheiRie KakudaYasunori YaoitaMasao Kikuchi
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2006 Volume 54 Issue 12 Pages 1705-1708

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Abstract

Five new phenylethanoid glycosides, lamiusides A (1), B (2), C (3), D (4) and E (5), were isolated from the whole plants of Lamium purpureum L. (Labiatae) together with seven known compounds (6—12). On the basis of chemical and spectral analyses, the structures of the new compounds were elucidated to be 2-(3,4-dihydroxyphenyl)ethyl-O-β-D-galactopyranosyl-(1→2)-α-L-rhamnopyranosyl-(1→3)-(4-O-trans-caffeoyl)-β-D-glucopyranoside (1), 2-(3,4-dihydroxyphenyl)ethyl-O-β-D-galactopyranosyl-(1→2)-α-L-rhamnopyranosyl-(1→3)-(4-O-trans-feruloyl)-β-D-glucopyranoside (2), 2-(3,4-dihydroxyphenyl)ethyl-O-β-D-galactopyranosyl-(1→2)-α-L-rhamnopyranosyl-(1→3)-(6-O-trans-caffeoyl)-β-D-glucopyranoside (3), 2-(3,4-dihydroxyphenyl)-R,S-methoxy-ethyl-O-β-D-galactopyranosyl-(1→2)-α-L-rhamnopyranosyl-(1→3)-(4-O-trans-caffeoyl)-β-D-glucopyranoside (4) and 2-(3-hydroxy-4-methoxyphenyl)ethyl-O-α-L-rhamnopyranosyl-(1→3)-β-D-glucopyranosyl-(1→6)-(4-O-cis-feruloyl)-β-D-glucopyranoside (5). In addition, the radical-scavenging activities of compounds 1—4 on 1,1-diphenyl-2-picrylhydrazyl radical were examined.

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© 2006 The Pharmaceutical Society of Japan
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