Four new phenones from the cortexes of Polygala tenuifolia.
From the 95% EtOH extract of the cortexes of Polygala tenuifolia, four new phenones and three known xanthones were isolated. The structures of the four new phenones were identified as 4-O-[alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranosyl]-2-hydroxyl-6-methoxybenzophenone (tenuiphenone A, 1), 3,5-di-C-beta-glucopyranosyl-2,4,6,3'-tetrahydroxybenzophenone (tenuiphenone B, 2), 2',4',6'-trihydroxyphenyl-(24Z)-triacontene-1-one (tenuiphenone C, 3), 2',4',6'-trihydroxyphenyl-(26Z)-dotriacontene-1-one (tenuiphenone D, 4) respectively, on the basis of spectroscopic analyses. The isolation of 1 and 2 supplied an evidence for the hypothesis that xanthone was biosynthesized from benzophenone in the plants.
Jiang
Yong
Y
Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center; Beijing 100083, China.
Tu
Pengfei
P
D001577:Benzophenones / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry; D031801:Polygala / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared
D001577:Benzophenones; D010936:Plant Extracts