Flavonóides O-glicosilados de Croton campestris St. Hill. (Euphorbiaceae)

Four flavonoids were isolated from the butanolic extract of the aerial parts of Croton campestris St. Hill. (Euphorbiaceae). These compounds were identified as 3-O-b-D-apiofuranosyl-(1®2)-galactopyranoside quercetin (1), 3-O-b-D-galactopyranoside quercetin (hyperin) (2), 3-O-a-L-arabinopyranoside quercetin (guaijaverin) (3) and 3-O-a-L-ramnopyranoside quercetin (quercitrin) (4). They have been isolated for the first time from Croton campestris. Their structures were elucidated by UV, MS and NMR experiments including 1H-1H (2D NOESY, 2D COSY), 1H-13C (2D HETCOR), 13C (APT) and by comparison of the spectral data with those reported in the literature.