Methylated A-type proanthocyanidins and related metabolites from Cassipourea gummiflua.
The range of natural dimeric A-type proanthocyanidins is extended by identification of two new dimeric afzelechins in the form of 7-OMe-epiafzelechin-(4 beta-->8,2 beta-->0-->7)- epiafzelechin and 7-OMe-epiafzelechin-(4 beta-->8, 2 beta-->0-->7)-ent-afzelechin. These are accompanied in the stem bark of Cassipourea gummiflua by the related metabolites afzelechin, kaempferol-3-0-alpha-L-rhamnopyranoside, afzelechin-3-0- alpha-L-rhamnopyranoside, epiafzelechin (4 beta-->8,2 beta-->0-->7)-epiafzelechin and epiafzelechin-(4 beta-->8, 2 beta-->0-->7)-ent-afzelechin, the latter three compounds being reported from a natural source for the second time.
Drewes
S E
SE
Department of Chemistry, University of Natal, Pietermaritzburg, South Africa.
Taylor
C W
CW
D000872:Anthocyanins / Q000737:chemistry / Q000302:isolation & purification*; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008969:Molecular Sequence Data; D044945:Proanthocyanidins; D016339:Spectrometry, Mass, Fast Atom Bombardment; D014197:Trees / Q000737:chemistry*
D000872:Anthocyanins; D044945:Proanthocyanidins; C013221:proanthocyanidin