Insect antifeedants from Croton jatrophoides: structures of zumketol, zumsenin, and zumsenol |
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| Authors: | Nihei Ken-ichi Asaka Yukihiro Mine Yoshihiro Kubo Isao |
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| Affiliation: | Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-31122, USA. |
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| Abstract: | Three new A-seco limonoids, zumketol (1), zumsenin (2), and zumsenol (3), were isolated from a methanol extract of Croton jatrophoides by bioassay-guided fractionation, and their structures were determined by NMR analysis. The alpha-ketol 1 may be biosynthesized via the intramolecular acyloin condensation of a dicarboxylate intermediate. |
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