Five New Xanthones from <i>Garcinia dulcis</i>

Abstract

From the bark of Garcinia dulcis, a new xanthone, dulciol A ( 1 ), was isolated in addition to two known xanthones [12b-hydroxydes- d -garcigerin ( 2 ) and toxyloxanthone B ( 3 )]. Furthermore, from the roots of this plant, four novel xanthones with a 1,1-dimethylallyl group, dulciols B−E ( 4 − 7 ), were obtained, besides eight known xanthones [ 2; garciniaxanthones A ( 8 ), B ( 9 ), and D ( 14 ); globuxanthone ( 10 ); and subelliptenones C ( 11 ), D ( 12 ), and F ( 13 )]. The structures of these xanthones were determined by spectroscopic analysis, including 2D NMR.