CALOCALABAXANTHONE, THE PUTATIVE ISOPRENYL PRECURSOR OF CALABAXANTHONE FROM CALOPHYLLUM CALABA

Article abstract of DOI:10.1016/0031-9422(82)83202-0

The bark of Calophyllum calaba var. calaba contains a new xanthone, 2,8-di-(3-methylbut-2-enyl)-1,3-dihydroxy-7-methoxyxanthone (calocalabaxanthone), the precursor of 5-hydroxy-8-methoxy-2,2-dimethyl-7-(3-methylbut-2-enyl)-2H,6H-pyano-(3,2-b)-xanthen-6-one (calabaxanthone).In addition the bark contains calabaxanthone and the other constituents isolated earlier from Calophyllum calaba var. worthingtonii.Key Word Index - Calophyllum calaba var. calaba; Guttiferae; xanthone; precursor.