Four new isoflavones from Ampelopsis grossedentata

Four new isoflavones have been isolated from the BuOH extract of Ampelopsis grossedentata Hand.-Mazz. Based on spectral and chemical methods, their structures were elucidated as 6,7-dihydroxy-3'-methoxy-4',5'-methylenedioxyisoflavone 1; 6,7-dihydroxy-3'-methoxy-4',5'-methylenedioxyisoflavone 6-O- g - d -glucopyranoside 2; 6,7-dihydroxy-3'-methoxy-4',5'-methylenedioxyisoflavone 6-O- f -L-rhamnopyranoside 3; 6,7-dihydroxy-3'-methoxy-4',5'-methylenedioxyisoflavone 6-O- g -D-xylopyranosyl-(1-6)- g -D-glucopyranoside 4. This is the first report on isolation of isoflavones from this plant.

Keywords:

• Ampelopsis Grossedentata
• Vitaceae
• Isoflavones