Ideamine N-Oxides: Pyrrolizidine Alkaloids Sequestered by the Danaine Butterfly,Idea leuconoe |
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| Authors: | Ritsuo Nishida Chul-Sa Kim Hiroshi Fukami Ryozo Irik |
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| Affiliation: | 1. Pesticide Research Institute, Faculty of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606, Japan;2. Department of Agricultural Chemistry, Shinshu University, Kamiina-gun, Nagano 399–45, Japan |
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| Abstract: | Two new pyrrolizidine alkaloids, ideamines A and B, together with other analogs (lycopsamine and parsonsine) were isolated in the N-oxide forms from adult bodies of the Apocynaceae-feeding danaine butterfly, Idea leuconoe. Ideamine A was characterized as a homolog of lycopsamine, in which the viridifloric acid moiety was replaced by a 2-ethyl-2,3-dihydroxybutanoic moiety. Likewise, ideamine B was identified as a nor-derivative of parsonsine, in which the trachelanthic acid moiety was replaced by a 2-ethyl-2,3-dihydroxybutanoic moiety diastereomeric to the necic acid from ideamine A. |
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