Two New Acylated Flavonol Glycosides from the Roots of Otostegia limbata

Two new acylated flavonol glycosides, 5‐hydroxy‐2‐(4‐hydroxyphenyl)‐4‐oxo‐7‐[(α‐L‐rhamnopyranosyl)oxy]‐4H‐chromen‐3‐yl β‐D‐glucopyranosyl‐(1→2)‐[β‐D‐glucopyranosyl‐(1→4)]‐[6‐O‐[(2E)‐3‐(4‐hydroxyphenyl)prop‐2‐enoyl]‐β‐D‐glucopyranosyl‐(1→3)]‐α‐L‐rhamnopyranoside (1) and 5‐hydroxy‐2‐(4‐hydroxyphenyl)‐...

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Bibliographic Details
Published in:Helvetica chimica acta 2009-04, Vol.92 (4), p.731-739
Main Authors: Khan, Afsar, Ahmad, Viqar U., Farooq, Umar
Format: Article
Language:English
Subjects:
Flavonol glycosides
Glycosides
Otostegia limbata
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Summary:Two new acylated flavonol glycosides, 5‐hydroxy‐2‐(4‐hydroxyphenyl)‐4‐oxo‐7‐[(α‐L‐rhamnopyranosyl)oxy]‐4H‐chromen‐3‐yl β‐D‐glucopyranosyl‐(1→2)‐[β‐D‐glucopyranosyl‐(1→4)]‐[6‐O‐[(2E)‐3‐(4‐hydroxyphenyl)prop‐2‐enoyl]‐β‐D‐glucopyranosyl‐(1→3)]‐α‐L‐rhamnopyranoside (1) and 5‐hydroxy‐2‐(4‐hydroxyphenyl)‐4‐oxo‐7‐[(α‐L‐rhamnopyranosyl)oxy]‐4H‐chromen‐3‐yl [6‐O‐[(2E)‐3‐(4‐hydroxyphenyl)prop‐2‐enoyl]‐β‐D‐glucopyranosyl‐(1→2)]‐[β‐D‐glucopyranosyl‐(1→4)]‐[6‐O‐[(2E)‐3‐(4‐hydroxyphenyl)prop‐2‐enoyl]‐β‐D‐glucopyranosyl‐(1→3)]‐α‐L‐rhamnopyranoside (2), were isolated from the roots of Otostegia limbata, along with two known flavones, cirsimaritin and 3′‐O‐methyleupatorin. Their structures were elucidated on the basis of spectroscopic evidences and chemical methods.
ISSN:0018-019X
1522-2675
DOI:10.1002/hlca.200800357