Chemical investigation of Ceylonese plants. Part XV. Extractives of Kayea stylosa Thw. (Guttiferae)

Abstract

From the bark extract of Kayea stylosa Thw., taraxerol (Ia), simiaren-3β-ol (IIa), betulinic acid (III), β-sitosterol, and the new xanthones 10-O-methylmacluraxanthone {12-(1,1-dimethylprop-2-enyl)-5,9-dihydroxy-10-methoxy-2,2-dimethyl-2H-pyrano[3,2-b]xanthen-6-one}(IVa) and kayeaxanthone {11-(1,1-dimethylprop-2-enyl)-9-hydroxy-8,10-dimethoxy-2,2-dimethyl-2H-pyrano[2,3-d]xanthen-7-one}(VIIIa) have been isolated and their structures established. The timber extract contained only 1,3,5-trihydroxy-2-methoxyxanthone (VIa) and β-sitosterol.