Two new xanthones, calozeyloxanthone and zeyloxanthonone, from Calophyllum zeylanicum(Guttiferae)

Abstract

Two new xanthones, calozeyloxanthone (1) and zeyloxanthonone (4), have been isolated from the bark of C. zeylanicum as well as betulinic acid, friedelan-3β-ol, calabaxanthone, taraxerone, friedelin, taraxerol, and β-sitosterol. Zeyloxanthonone (4) is identical with wightianone and the structure of the latter is revised. The timber of C. zeylanicum yielded 6-deoxyjacareubin (11), 1,6-dihydroxy-5-methoxyxanthone, 1,5-dihydroxyxanthone, 1,7-dihydroxyxanthone, 2-hydroxyxanthone, and jacareubin.