期刊
PLANTA MEDICA
卷 79, 期 8, 页码 661-665出版社
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0032-1328482
关键词
Xanthium sibiricum; Compositae; sesquiterpene lactones; xanthanolides; cytotoxicity
资金
- National Basic Research Program of China (973 Program) [2009CB522804]
- NSFC [20932007]
Chemical investigation of the aerial parts of Xanthium sibiricum led to the isolation of four new xanthanolide-type sesquiterpene lactones, including two xanthanolide dimers, pungiolide D (1) and pungiolide E (2), and two xanthanolide monomers, 8-epi-xanthatin-1 alpha,5 alpha-epoxide (3) and 1 beta-hydroxyl-5 alpha-chloro-8-epi-xanthatin (4), together with four known compounds, pungiolide A (5), 8-epi-xanthatin-1 beta,5 beta-epoxide (6), xanthatin (7), and 11 alpha,13-dihydro-8-epi-xanthatin (8). The structures of these compounds were elucidated on the basis of spectroscopic data analysis. Pungiolide D (1) displayed an unusual structure featuring a 5/5/6-fused tricyclic system in the unit B. Compound 4 was shown to be a rare sesquiterpene lactone containing halogen, and its absolute configuration was determined by X-ray crystallographic analysis. The evaluation of the cytotoxic activities of the isolated new compounds against the SNU387 liver and A-549 lung human cancer cell lines showed that compound 4 possessed significant in vitro cytotoxicity with an IC50 value of 5.1 mu M against SNU387 liver cells.
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