Flavonol and Chalcone Ester Glycosides fromBidensandicola

Abstract

Five new flavonol 7-O-glycosides (1−5), having quercetin or quercetin 3-methyl ether as their aglycons, and sugar chains made up of three or four sugars, including β-d-glucopyranose, α-l-rhamnopyranose, and β-d-xylopyranose, have been isolated from the aerial parts of Bidens andicola, along with a new chalcone ester glycoside (6) and five known chalcone ester glycosides. The structures of 1−6 were elucidated using a combination of spectroscopic techniques.