Abstract
From the 1-BuOH-soluble fraction of a MeOH extract of Euphorbia hirta, collected in the Okinawa islands, three new megastigmane glucoside gallates, named hirtionosides A–C, 3-hydroxyoctanoic acid glucosides and a phenylpropanoid glucoside were isolated along with 15 known compounds. The structures of the new compounds were elucidated by detailed analysis of physical data, including one- and two-dimensional NMR spectra, and those of known compounds were determined by comparison of physico-chemical data with those reported in the literature. The absolute structures of the megastigmanes were determined by comparison of NMR data and Cotton effects in the CD spectra. The modified Mosher’s method was applied to determine the absolute structure of the chiral center in 3-hydroxyoctanoic acid. The DPPH radical-scavenging properties of megastigmane glucoside gallates were assayed and, as expected, they showed moderate activity.



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Acknowledgments
The authors are grateful for access to the superconducting NMR instrument (JEOL JNM α-400) at the Analytical Center of Molecular Medicine of the Hiroshima University Faculty of Medicine, and an Applied Biosystem QSTAR XL system ESI (Nano Spray)-MS at the Analysis Center of Life Science of the Graduate School of Biomedical Sciences, Hiroshima University. This work was supported in part by Grants-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the Japan Society for the Promotion of Science. Thanks are also due to the Research Foundation for Pharmaceutical Sciences and the Takeda Science Foundation for financial support.
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Nomoto, Y., Sugimoto, S., Matsunami, K. et al. Hirtionosides A–C, gallates of megastigmane glucosides, 3-hydroxyoctanoic acid glucosides and a phenylpropanoid glucoside from the whole plants of Euphorbia hirta . J Nat Med 67, 350–358 (2013). https://doi.org/10.1007/s11418-012-0692-5
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DOI: https://doi.org/10.1007/s11418-012-0692-5