title: Insect antifeedants from Croton jatrophoides: structures of zumketol, zumsenin, and zumsenol.
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.
authors.affiliation: Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-31122, USA.
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Nihei
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Asaka
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Mine
authors.forename: Isao
authors.initials: I
authors.lastname: Kubo
mesh_terms: D000818:Animals; D029802:Croton / Q000737:chemistry*; D005247:Feeding Behavior / Q000187:drug effects*; D007630:Kenya; D007814:Larva / Q000187:drug effects; D007915:Lepidoptera / Q000187:drug effects*; D036701:Limonins / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D024301:Plant Bark / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D036701:Limonins; C499027:zumketol; C499028:zumsenin; C499029:zumsenol