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Two New Acylated Flavonol Glycosides from the Roots of Otostegia limbata

✍ Scribed by Afsar Khan; Viqar U. Ahmad; Umar Farooq

Publisher
John Wiley and Sons
Year
2009
Tongue
German
Weight
207 KB
Volume
92
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

magnified image

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

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