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Identification de xanthones et de nouveaux arabinosides de C‐glucosides flavoniques dans Swertia perennis L.
Author(s) -
Hostettmann Kurt,
JacotGuillarmod André
Publication year - 1976
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.19760590517
Subject(s) - xanthone , chemistry , mangiferin , isovitexin , orientin , stereochemistry , glucoside , gentianaceae , botany , flavonoid , organic chemistry , chromatography , vitexin , medicine , alternative medicine , pathology , biology , antioxidant
Identification of xanthones and new arabinosides of flavone C‐glucosides from Swertia perennis L. – Seven tetraoxygenated xanthones [1,3,7,8‐tetrahydroxy‐xanthone ( 1 ); 1,8‐dihydroxy‐3,7‐dimethoxy‐xanthone ( 2 ); 1,7‐dihydroxy‐3,8‐dimethoxy‐xanthone ( 3 ); 1‐hydroxy‐3,7,8‐trimethoxy‐xanthone ( 4 ); 3,7,8‐trihydroxy‐xanthone‐xanthone‐1‐0‐β‐glucoside ( 5 ); 3,7,8‐trimethoxy‐xanthone‐1‐0‐primeveroside ( 6 ); 8‐hydroxy‐3,7‐dimethoxy‐xanthone‐1‐0‐primeveroside ( 7 )] have been isolated chromatographically, using polyamide columns, from roots of Swertia perennis L . From leaves and stems of the same plant, six xanthones [1,5,8‐trihydroxy‐3‐methoxy‐xanthone ( 8 ); 1,5‐dihydroxy‐3‐methoxy‐xanthone‐8‐0‐β‐glucoside ( 9 ); mangiferin ( 10 ); 1 ; 4 ; 5 ] and four flavone C‐glycosides [iso‐orientin ( 11 ); isovitexin ( 12 ); iso‐orientin‐6″‐arabinoside ( 13 ); isovitexin‐6″‐arabinoside ( 14 )] have also been isolated. Among these compounds, 7 , 13 and 14 were not encountered before in nature. In the last two compounds, the position of arabinose on the C‐glucoside moiety of the flavone was established by 13 C‐NMR. spectroscopy.