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

Abstract

Abstract 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.