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Acacienone, a terpenoid-like natural product having an unprecedented C20 framework isolated from Acacia mangium leaves

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Abstract

A novel C20 natural product, acacienone (1), was isolated from the leaves of Acacia mangium collected in Bangladesh. The structure of compound 1 was elucidated by spectral studies and X-ray crystallographic analysis. Acacienone (1) possesses a terpenoid-related tetracyclic framework containing 20 carbons with biogenetically unusual structural features: (i) vicinal C1-branches at the C-3 and C-4 positions in the A ring, and (ii) a cyclopentenone D ring in an androsterone-like assembly, lacking a methyl group at the C-13 position.

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Acknowledgements

This work was supported by KAKENHI Grant No. 20H03394 and 20K16024 from the Japan Society for the Promotion of Science. We would like to thank Dr. Tomoki Yoneda, Hokkaido University, for valuable suggestions.

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Correspondence to Masami Ishibashi.

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Hara, Y., Totsugi, Y., Ichikawa, H. et al. Acacienone, a terpenoid-like natural product having an unprecedented C20 framework isolated from Acacia mangium leaves. J Nat Med 75, 99–104 (2021). https://doi.org/10.1007/s11418-020-01457-y

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  • DOI: https://doi.org/10.1007/s11418-020-01457-y

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