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Two New Acylated Flavonol Glycosides from the Roots of Otostegia limbata
Author(s) -
Khan Afsar,
Ahmad Viqar U.,
Farooq Umar
Publication year - 2009
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200800357
Subject(s) - chemistry , glycoside , flavones , stereochemistry , chromatography
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.