期刊
JOURNAL OF NATURAL PRODUCTS
卷 70, 期 7, 页码 1139-1145出版社
AMER CHEMICAL SOC
DOI: 10.1021/np078006q
关键词
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Eight new oxygenated lignans, kadsuphilols A-H (1-8), were isolated from the leaves and stems of Kadsura philippinensis. Four of the isolated lignans (1-4) possess the normal C-18-dibenzocyclooctadiene skeleton, while the other four lignans (5-8) are C-19-homolignans possessing a substituted cyclohexadienone ring with a spiro-benzofuranoid moiety. The structures of the isolated metabolites were elucidated through spectroscopic analyses, including 2D NMR experiments. Compounds 1 and 4 are the first report of an R-biphenyl configuration with a beta-oxygenated substituent at the C-9 position. The in vitro radical-scavenging activities of these compounds using DPPH were tested and evaluated. Compound 3 exhibited more potent activity than vitamins C and E.
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