XANTHONES AND NEOFLAVONOIDS FROM TWO ASIAN SPECIES OF CALOPHYLLUM

Article abstract of DOI:10.1016/S0031-9422(00)84521-5

Key Word Index - Calophyllum macrocarpum; C. walkeri; Guttiferae; stem bark; neoflavonoids; 1,3,7-oxygenated xanthones; chemical systematics.The stem barks of both Calophyllum macrocarpum and C. walkeri have yielded the known neoflavonoid apetalic acid.In addition, C. walkeri bark gave four 1,3,7-oxygenated xanthones with prenyl substituents at C-2 and C-8.One of xanthones has been identified as thwaitesixanthone, and the other three as the related novel derivatives thwaitesixanthonol, demethylcalabaxanthone and 2"-isopropenyl-3"-hydroxydihydrofuranodemethylcalabaxanthone.