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DOI: 10.1055/s-2008-1081332
© Georg Thieme Verlag KG Stuttgart · New York
New Flavonoids from Boldoa purpurascens Cav.
Publikationsverlauf
Received: April 14, 2008
Revised: June 11, 2008
Accepted: June 16, 2008
Publikationsdatum:
14. August 2008 (online)
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Abstract
Phytochemical analysis of the leaves of Boldoa purpurascens Cav. led to isolation of four flavone glycosides, three of which are new compounds. Their structures have been determined by mass spectrometry and by 1 D and 2 D NMR analysis, i. e., 4′,5-dihydroxy-6,7-methylenedioxyflavonol 3-O-α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranoside (1), 4′,5-dihydroxy-6,7-methylenedioxyflavonol 3-O-β-D-xylopyranoside (2), and 4′,5-dihydroxy-6,7-methylenedioxyflavonol 3-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside (3). The known compound was 4′,5-dihydroxy-6,7-methylenedioxyflavonol 3-O-β-D-glucopyranoside (4). The aglycone 4′,5-dihydroxy-6,7-methylenedioxyflavonol is known as gomphrenol. Compounds 1 and 2 failed to show antifungal activity when tested against three different strains of fungi, i. e., Fusarium culmorum, Botrytis cinerea, and Aspergillus flavus.
Key words
Boldoa purpurascens - Nyctaginaceae - flavonoid glycosides - gomphrenol glycosides - antifungal activity
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