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(University of Dschang) (University of Dschang) (University of Dschang) (University of Dschang) (University of Dschang) (Univ Rennes) (University of Dschang) (Univ Rennes) (CNRS) (Carleton University) (University of Dschang)
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한국생약학회 Natural Product Sciences Natural Product Sciences Vol.31 No.2
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    초록·키워드

    A chromatographic separation of the methanol extract of the leaves of Strombosiopsis tetrandra Engl. yielded a new cerebroside (tetrandrabroside) (1) in addition, to fourteen compounds available in the literature. The known compounds include three kaempferol glycosides (2–4) and their aglycone (5), quercetin (6), catechin (7), lupeol (8), lupenon (9), glochidon (10), glochidiol (11), oleanolic acid (12), 2-ethylhexyl isonicotinate (13), phospocholine (14), and β-sitosterol-3-O-glucoside (15). Benzylation of the kaempferol di-glycoside (2) afforded two new semisynthetic derivatives: kaempferol-5,7,4'-tribenzyl-3-O-(2′′,6′′-di-O-α-L-rhamnopyranosyl)-β-D- glucopyranoside (2a) and kaempferol-7,4'-dibenzyl-3-O-(2′′,6′′-di-O-α-L-rhamnopyranosyl)-β-D-glucopyranoside (2b). Their structures were established by a combination of spectroscopic techniques. Extracts and compounds exhibited good and moderate antibacterial activities (32 ≤ MIC ≤ 512 µg/mL) against Staphylococcus aureus ATCC 25923, Streptococcus pneumoniae ATCC 49619, Escherichia coli ATCC 8739 and Klebsiella pneumoniae 109.

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