Planta Med 2013; 79(08): 661-665
DOI: 10.1055/s-0032-1328482
Natural Product Chemistry
Original Papers
Georg Thieme Verlag KG Stuttgart · New York

Cytotoxic Sesquiterpene Lactones from Aerial Parts of Xanthium sibiricum

Lun Wang
1   Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
2   Graduate University of Chinese Academy of Sciences, Beijing, China
,
Jing Wang
1   Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
2   Graduate University of Chinese Academy of Sciences, Beijing, China
,
Fu Li
1   Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
,
Xin Liu
3   Beijing Entry-Exit Inspection and Quarantine Bureau, Beijing, China
,
Bin Chen
1   Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
,
Ya-Xiong Tang
1   Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
,
Ming-Kui Wang
1   Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
› Author Affiliations
Further Information

Publication History

received 12 December 2012
revised 12 March 2013

accepted 21 March 2013

Publication Date:
23 May 2013 (online)

Abstract

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-1α,5α-epoxide (3) and 1β-hydroxyl-5α-chloro-8-epi-xanthatin (4), together with four known compounds, pungiolide A (5), 8-epi-xanthatin-1β,5β-epoxide (6), xanthatin (7), and 11α,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 µM against SNU387 liver cells.

Supporting Information

 
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