Bangangxanthone A and B, two xanthones from the stem bark of Garcinia polyantha Oliv |
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| Authors: | Lannang A Meli Komguem J Ngninzeko F Ngounou Tangmouo J Gustave Lontsi D Ajaz Asma Choudhary M Iqbal Ranjit Rosa Devkota Krishna P Sondengam B Luc |
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| Institution: | Department of Organic Chemistry, Faculty of Sciences, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon. alainmeli@yahoo.com |
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| Abstract: | Two xanthones, bangangxanthone A (1) 1,5,8-trihydroxy-6'-methyl-6'-(4-methylpent-3-enyl)- pyrano2',3':3,4]xanthone] and B (2) 1,4,8-trihydroxy-2-prenylxanthone], along with two known xanthones, 1,5-dihydroxyxanthone, 2-hydroxy-1,7-dimethoxyxanthone and the pentacyclic triterpenoids, friedelin, oleanolic acid and lupeol were isolated from the chloroform extract of the stem bark of Garcinia polyantha. The structures of these compounds were assigned by spectroscopic analysis. Compounds 1-4 showed antioxidant DPPH radical scavenging activities. |
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| Keywords: | Garcinia polyantha Guttiferae Bangangxanthone A Bangangxanthone B Prenylated xanthones Antioxidant |
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