新規抗幼若ホルモン活性物質の合成と生物活性(<特集>農薬活性分子の作用機構研究に関する最近の進歩)

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  • Kuwano Eiichi
    Laboratory of Pesticide Chemistry, Department of Applied Genetics and Pest Management, Faculty of Agriculture, Kyushu University
  • Fujita Norihiro
    Laboratory of Pesticide Chemistry, Department of Applied Genetics and Pest Management, Faculty of Agriculture, Kyushu University
  • Furuta Kenjiro
    Laboratory of Pesticide Chemistry, Department of Applied Genetics and Pest Management, Faculty of Agriculture, Kyushu University
  • Yamada Naotaka
    Laboratory of Pesticide Chemistry, Department of Applied Genetics and Pest Management, Faculty of Agriculture, Kyushu University

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タイトル別名
  • Synthesis and biological activity of novel anti-juvenile hormone agents

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Ethyl 4-[2-(tert-butylcarbonyloxy)butoxy]benzoate (ETB) is a partial juvenile hormone (JH) antagonist which targets larval epidermis. We converted ETB to ethyl 4-(2-substituted alkyloxy)benzoates. These compounds induced precocious metamorphosis in the silkworm, Bombyx mori, which is a clear sign of JH deficiency, and their activity was completely counteracted by the simultaneous application of a JH agonist, methoprene. Among these novel compounds, ethyl 4-(2-benzylhexyloxy)benzoate (KF-13) showed high precocious metamorphosis-inducing activity at low doses, but its activity decreased with increasing dose, probably due to their JH-like activity. KF-13 is an enantiomeric compound. The (S)-enatiomer of KF-13 was more active than the (R)-enantiomer at low doses, but at high doses the activity was reversed (R>S). Hemolymph JH esterase activity, which is indispensable for the initiation of pupation in normal last-instar larvae, was induced in 4th-instar larvae by treatment with KF-13. 2-(6-Methyl-3-pyridyloxy)hexyl and 2-phenoxyhexyl analogs showed JH activity when topically applied to allatechtomized 4th-instar larvae.

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