Flavonoid sulfates from the Convolvulaceae1Part 7 in the series “Phytochemistry and Chemotaxonomy of the Convolvulaceae”. For part 6 see Schimming, T., Mann, P., Tofern, B., Richter, A., Jenett-Siems, K., Dräger, B., Asano, N., Gupta, M. P., Correa, M. D. and Eich, E., Phytochemistry (submitted). Presented in part at the 45th Annual Congress of the Society for Medicinal Plant Research, 1997,

Abstract

Abstract A novel flavonoid, quercetin 7-methyl ether-3,3′-disulfate ( 5 ), was obtained from the roots of Argyreia mollis , together with the known compounds quercetin 7-methyl ether-3-sulfate ( 4 ) and kaempferol 7-methyl ether-3-sulfate ( 2 ). Two further new flavonoid sulfates, quercetin 3,7-dimethyl ether-4′-sulfate ( 6 ) and quercetin 3′,4′,7-trimethyl ether-3-sulfate ( 8 ), were isolated from the aerial vegetative parts of Ipomoea regnellii , together with the known compound kaempferol 4′,7-dimethyl ether-3-sulfate ( 3 ). This is the first report on sulfated flavonoids in the Convolvulaceae family and, furthermore, the presence of flavonoids in A. capitata , A. mollis , I. reticulata and I. regnellii is reported for the first time.