Chemical and Chemotaxonomical Studies of Filices. LXV. : A Few New Flavonoid Glycosides. (2)(Organic)

Abstract

From the fronds of the following ferns the flavonoid compounds, including three new glycosides, were isolated and their structures elucidated by chemical and spectroscopic methods. From Brainea insignis J. SM. a new flavonol acylglycoside kaempferol 3-O[2-O-(6-O-caffeoyl)-β-D-glucopyranosyl]-β-D-galactopyranoside (I), from Thelypteris palustris SCHOTT a new flavanone glycoside (2S)-5, 7-dihydroxy-6-methylflavanone 7-O-β-D-glucopyranoside (II), cryptostrobin ((2S)-5, 7-dihydroxy-8-methylflavanone), kaempferol 3-O-β-D-glucopyranoside and kaempferol 3-O-β-rutinoside and from Adiantum malesianum GATAK. a new flavonol glycoside kaempferol 3-O-α-D-galactopyranoside (III), vitexin, isovitexin, hyperin (quercetin 3-O-β-D-galactopyranoside) and kaempferol 3-O-β-D-galactopyranoside were isolated.