Abstract
Five new acyclic amides, clausenalansamides C-G (1–5), clausenaline G (6) and (±)-5-(4-methylphenyl)-γ-valerolactone (7) reported from the natural source for the first time, were characterized from the leaves of Clausena lansium. Their structures were established by spectroscopic and spectrometric methods, and the absolute configurations of new compounds 1–5 were determined by electronic circular dichroism and single-crystal X-ray diffraction analyses. Eighteen compounds were evaluated for their anti-inflammatory activity and only imperatorin (11) and wampetin (12) displayed significant inhibition of fMLP/CB-induced superoxide anion generation with IC50 values of 1.7 ± 0.3 and 6.8 ± 1.1 μM, respectively.
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Acknowledgments
This study was sponsored by the Ministry of Science and Technology, Taiwan, ROC granted to T.-S. Wu, and supported in part by the Vietnam National Foundation for Science and Technology Development (Nr. 104.01-2010.27), and Chang Gung Memorial Hospital (CMRPD1B0481~3, CMRPD1D0281~3, and BMRP450 to H-L Hwang). We also thank Associate Prof. Dr. Tran Huy Thai (Institute of Ecology and Biological Resources, Vietnamese Academy of Science and Technology, Vietnam) for the identification of the plant materials.
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D.-Y. Shen and P.-C. Kuo contributed equally to this work.
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Shen, DY., Kuo, PC., Huang, SC. et al. Constituents from the leaves of Clausena lansium and their anti-inflammatory activity. J Nat Med 71, 96–104 (2017). https://doi.org/10.1007/s11418-016-1033-x
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DOI: https://doi.org/10.1007/s11418-016-1033-x