Bangangxanthone A and B, two xanthones from the stem bark of Garcinia polyantha Oliv.
Two xanthones, bangangxanthone A (1) [1,5,8-trihydroxy-6'-methyl-6'-(4-methylpent-3-enyl)- pyrano[2',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.
Lannang
A Meli
AM
Department of Organic Chemistry, Faculty of Sciences, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon. alainmeli@yahoo.com
Komguem
J
J
Ngninzeko
F Ngounou
FN
Tangmouo
J Gustave
JG
Lontsi
D
D
Ajaz
Asma
A
Choudhary
M Iqbal
MI
Ranjit
Rosa
R
Devkota
Krishna P
KP
Sondengam
B Luc
BL
D001713:Biphenyl Compounds / Q000737:chemistry; D016166:Free Radical Scavengers / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D029760:Garcinia / Q000737:chemistry*; D006834:Hydrazines / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010851:Picrates; D024301:Plant Bark / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D006834:Hydrazines; D010851:Picrates; D044004:Xanthones; C506415:bangangxanthone A; C506416:bangangxanthone B; C004931:1,1-diphenyl-2-picrylhydrazyl