title: Xanthones from Hypericum roeperanum.
abstract: Four new xanthones have been isolated from the roots of Hypericum roeperanum. Their structures have been established by a combination of spectroscopic and chemical methods as 1,6-dihydroxy-5-methoxy-4',5'-dihydro-4',4',5'-trimethylfurano- (2',3':3,4)-xanthone (5-O-methyl-2-deprenylrheediaxanthone B), 1,6-dihydroxy-5-methoxy-6',6'-dimethylpyrano-(2',3':3,4)-xanthone (5-O-methylisojacareubin), 1,3,5,6-tetrahydroxy-2-(2',2'-dimethyl-4'-isopropenyl)-cyclopen tanylxanthone (5-O-demethylpaxanthonin) and 1,3,5,6-tetrahydroxy-4-trans-sesquilavandulylxanthone (roeperanone). In addition, 2-hydroxyxanthone, 5-hydroxy-2-methoxyxanthone, 1,5-dihydroxy-2-methoxyxanthone, 2-deprenyl rheediaxanthone B, isojacareubin and calycinoxanthone D have been isolated and characterized. Some of the isolated xanthones exhibited antifungal activity against Candida albicans.
authors.affiliation: Institut de Pharmacognosie et Phytochimie, Université de Lausanne, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Rath
authors.forename: O
authors.initials: O
authors.lastname: Potterat
authors.forename: S
authors.initials: S
authors.lastname: Mavi
authors.forename: K
authors.initials: K
authors.lastname: Hostettmann
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002176:Candida albicans / Q000187:drug effects*; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D009904:Optical Rotation; D013329:Structure-Activity Relationship; D014966:Xanthenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D044004:Xanthones
chemical_list: D000935:Antifungal Agents; D014966:Xanthenes; D044004:Xanthones; C009689:xanthone