Chemical investigation of ceylonese plants. Part XVI. Extractives of Calophyllum cordato-oblongum Thw. (Guttiferae)

Abstract

From the bark of Calophyllum cordato-oblongum Thw. the new resin acid, cordato-oblongic acid (Ia) was isolated and identified as 3-(6,7-dihydro-5-hydroxy-2,2,trans-7,8-tetramethyl-6-oxo-2H,8H-benzo[1,2-b:5,4-b′]-dipyran-10-yl)butyric acid. The timber extract contained the known xanthones 2-hydroxyxanthone (VIII), scriblitifolic acid (X), 1,5,6-trihydroxyxanthone (VIIb), 1,6-dihydroxy-5-methoxyxanthone (VIIa), and jacareubin (XV), and the two new xanthones 3-hydroxy-4-methoxyxanthone (IXa) and cordato-oblonguxanthone (XIII){identified as 1,2-dihydro-6-hydroxy-3,3-dimethylpyrano[2,3-a]xanthen-12(3H)-one}. Friedelin and β-sitosterol were isolated from both extracts.