Contribution à la phytochimie du genre Gentiana, VI. Etude des xanthones dans les feuilles de Gentiana bavarica L.

Ten tetraoxygenated xanthones (1‐hydroxy‐3, 7, 8‐trimethoxyxanthone I; 1, 7‐dihydroxy‐3, 8‐dimethoxyxanthone II; 1, 7, 8‐trihydroxy‐3‐methoxyxanthone III; 1, 3, 7, 8‐tetrahydroxyxanthone IV; 3, 7, 8‐trimethoxyxanthone‐1‐O‐primeveroside V; 7‐hydroxy‐3, 8‐dimethoxyxanthone‐1‐O‐primeveroside VI; 1, 8‐dihydroxy‐3‐methoxyxanthone‐7‐O‐acetylrutinoside VII; 7, 8‐dihydroxy‐3‐methoxyxanthone‐1‐O‐primeveroside VIII; 3, 7, 8‐trihydroxyxanthone‐1‐O‐primeveroside IX; 3, 7, 8‐trihydroxyxanthone‐1‐O‐glucoside X) have been isolated from leaves of Gentiana bavarica L. by means of column chromatography on polyamid. Among these xanthones, VI, VII, VIII and IX were not encountered before in nature.