Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 18, Issue 17, Pages 5213-5221Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201104078
Keywords
inhibitors; NMR spectroscopy; residual dipolar couplings; structure elucidation; vatiparol
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Funding
- Natural Science Foundation of China [81121062, 81172948, 20802035]
- Ministry of Education [NCET-10-0477]
- Jiangsu Province [BK2009010]
- Max Planck Society
- Deutsche Forschungsgemeinschaft [GRK 782, FOR 934]
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Bioactive natural products offer multiple opportunities for the discovery of novel chemical entities with potential pharmaceutical, nutraceutical and agrochemical applications. Many new organic compounds with novel scaffolds are isolated in small quantities and established methods often fail to determine the structure and bioactivity of such novel natural products. To meet this challenge, we present here a new methodology combining RDC (residual dipolar coupling)-based NMR spectroscopy in microtubes, with a motif-inspired biological assessment strategy. Using only one milligram (ca. 1.5 mu mol) of sample, the new protocol established the bioactivity as well as the relative and absolute configuration of vatiparol obtained from Vatica parvifolia. Vatiparol is unique in its unprecedented carbon skeleton and selective inhibitory effect on the expression of monocyte chemo-attractant protein-1 (MCP-1, also known as CCL2). The plausible biosynthetic pathway of vatiparol is briefly discussed. The approach introduced here promises to be widely applicable to the determination of the structure and bioactivity of structurally unknown organic samples available in very limited amounts.
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