New isocoumarin and stilbenoid derivatives from the tubers of Sparganium stoloniferum (Buch.-Ham.)

AbstractA new isocoumarin derivative 8,5′-dihydroxy-6′-methoxy-4-phenyl-5,2′-oxidoisocoumarin (1) and a new stilbenoid derivative methyl 5-hydroxy-2-(2-hydroxyphenyl)benzofuran-4-carboxylate (2) together with nine known compounds (3–11) were isolated from the tubers of Sparganium stoloniferum Buch.-Ham.. Another stilbenoid derivative (3) and a xanthone (4) were identified as new natural products and compounds 5–10 were obtained for the first time from the genus Sparganium. All their structures were elucidated by comprehensive spectroscopic analysis and comparison with available literature information.