Synthesis and insecticidal activity of 3,4-dihydropyrimidine-2(1H)-thiones against the pulse beetle, Callosobruchus chinensis

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  • 3,4‐ジヒドロピリミジン‐2(1H)‐チオン類の合成とアズキゾウムシに対する殺虫作用

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A series of twenty substituted 3,4-dihydropyrimidine derivatives were prepared and characterized by TLC, IR, 1H NMR, 13C NMR spectroscopic data and elemental analysis. These were screened for insecticidal activity by the film residue method against the pulse beetle (adzuki bean weevil, Callosobruchus chinensis). 4-(2′-Chlorophenyl)-6-phenyl-3,4-dihydropyrimidine-2(1H)-thione (LC50 0.00201 mg/cm2), 4-(2′-chlorophenyl)-6-p-tolyl-3,4-dihydropyrimidine-2(1H)-thione (LC50 0.00122 mg/cm2), 4-(4′-methoxyphenyl)-6-(4″-methylphenyl)l-3,4-dihydropyrimidine-2(1H)-thione (LC50 0.00164 mg/cm2), 4-(4′-chlorophenyl)-6-(4″-methoxyphenyl)-3,4-dihydropyrimidine-2(1H)-thione (LC50 0.00175 mg/cm2) were found to be more effective than dichlorvos (2,2-dichlorovinyl dimethyl phosphate, LC50 0.00243 mg/cm2), a commercial insecticide recommended for managing Callosobruchus chinensis.

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