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Seven 7-hydroxycoumarin (C) acylation derivatives (C1-C7) were synthesized to determine the differences in antifeedant effects between these derivatives and tutin against Mythimna separata. The structural assignments of these semisynthetic compounds were examined based on their IR, ESIMS, and 1H- and 13C-NMR spectral data. Compounds C2-C7, tutin, andrographolide and azadirachtin showed different antifeedant activities. Compared with tutin and andrographolide, the derivatives C3, C4, C5 and C7 presented greater antifeedant activities. It was concluded that the optimal insecticidal agent is C4 (7-methanesulfonyloxycoumarin). © Pesticide Science Society of Japan.

Antifeedant activities of tutin and 7-hydroxycoumarin acylation derivatives against Mythimna separata