2013•Natural Product CommunicationsOpen access

Kaempferol 3,7,4’-glycosides from the Flowers of Clematis Cultivars

Keisuke Sakaguchi, Junichi Kitajima, Tsukasa Iwashina

Abstract

A new kaempferol glycoside, kaempferol 3-O-alpha-rhamnopyranosyl-(1 --> 6)-beta-glucopyranoside-7,4'-di-O-beta-glucopyranoside (1) was isolated from the flowers of Clematis cultivars "Jackmanii Superba" and "Fujimusume", together with the known compound kaempferol 3,7,4'-tri-O-beta-glucopyranoside (2). The chemical structures of the isolated kaemferol glycosides were established by UV, 1H and 13C NMR spectroscopy, LC-MS, and characterization of acid hydrolysates.

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Key concepts: Kaempferol, Glycoside, Clematis, Chemistry, Cultivar, Botany, Stereochemistry, Quercetin