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Synthesis and insecticidal activity studies of novel phenylpyrazole derivatives containing arylimine or carbimidate moiety.

Abstract：

:Phenylpyrazole insecticides are successful for crop protection and public hygiene by blocking gamma-aminobutyric acid (GABA)-gated chloride channels and glutamate-gated chloride (GluCl) channels. A series of novel phenylpyrazoles containing arylimine or 1-methoxyaryl groups were designed and synthesized. The addition reaction of methanol to the imines 1-11 was investigated and the cayno addition products 13-15 were obtained. The compounds 1-15 were confirmed by 1H NMR and elemental analysis. The results of bioassay indicated that some compounds exhibited comparable bioactivity to fipronil against a broad spectrum of insects such as bean aphid (Aphis craccivora), mosquito (Culex pipiens pallens), diamondback moth (Plutella xylostella) and Oriental armyworm (Mythimna separata). Especially, the foliar contact activity against bean aphid of compound 7 at 10 µg mL-1 was 68%, the larvacidal activity against mosquito of compounds 5, 13 and 15 at 0.0025 µg mL-1 was 100%, the larvacidal activity against diamondback moth of compounds 9 and 11 at 0.05 µg mL-1 was 100%, the larvacidal activity against Oriental armyworm of compound 9 at 1 µg mL-1 was 100%. The 3-cayno moiety on pyrazole ring was essential for the high insecticidal activities against bean aphid, diamondback moth and Oriental armyworm, while the 3-carbimidate moiety on pyrazole ring was crucial to the excellent high insecticidal activities against mosquito.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Zhao Q,Sun R,Liu Y,Chen P,Li Y,Yang S,Wang Q

doi

10.1016/j.bmc.2019.115092

subject

Has Abstract

pub_date

2019-11-01 00:00:00

pages

115092

issue

21

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(19)31244-1

journal_volume

27

pub_type

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