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Naphthopyranones from rhizomes of Paepalanthus diffissus

Abstract:

From a dichloromethane extract obtained of rhizomes of Paepalanthus diffissus Moldenke (Eriocaulaceae) were isolated the bioactive naphthopyranones (+)-semi-vioxanthin [3] and vioxanthin [8]. These compounds were characterized on the basis of spectroscopic studies, including 1D-and 2D-NMR experiments. The literature review indicated that these metabolites are frequently found in fungi and lichens, but they are rare compounds in higher plants. Presence of (+)-semi-vioxanthin in flowering plants is here described by first time.