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Paper | Regular issue | Vol 45, No. 2, 1997, pp.299-307
Published online, 1st January, 1970
DOI: 10.3987/COM-96-7652
New Linear Pyranoxanthones from Calophyllum apetalum

Munekazu Iinuma,* Tetsuro Ito, Hideki Tosa, Toshiyuki Tanaka, Ryoko Miyake, and Veliah Chelladurai

*Departmeny of Pharmacognosy, Gifu Pharmaceutical University, 6-1 Mitahora-higashi 5-chome, Gifu 502-8585, Japan


The invesitgation of chemical constituents in stem bark and root of Calophyllum apetalum (Guttiferae) led to isolate sixteen xanthones and two coumarin derivatives. Among them, two linear pyranoxanthones [caloxanthones I (1) and J (2)] from the stem bark, and two xanthones [caloxanthone K (10) and 1,3,6,8-trihydroxy-2-methoxyxanthone (12)] from the root were new ones. The respective structures were determined by the spectral analysis.