Abstract
Background: Benzoylureas are the most commonly used chitin synthesis inhibitors. But, the exact target site of benzoylurea insecticides has not been identified.
Objective: To study whether benzoylphenylureas analogues with a bipartite model could be designed and synthesized as novel insecticides with improved activities.
Methods: Based on the bipartite model of the sulfonylurea receptor binding site and commercial diflubenzuron, a series of novel benzoylureas containing carbamate groups were designed and synthesized via the key intermediate 2,6-difluoro-N-((4-hydroxyphenyl)carbamoyl)benzamide (2). The structures of the target compounds were confirmed by the 1H NMR and high-resolution mass spectrum (HRMS).
Results: The results of bioassays indicated that these target compounds possessed good larvicidal activities against a broad spectrum of insects such as oriental armyworm (Mythimna Separata Walker), diamondback moth (Plutella xylostella), and mosquito (Culex pipiens pallens). A compound containing N, N-diisopropyl (3g) exhibited the highest insecticidal activity against oriental armyworm (40% at 10 mg kg-1), which was comparable with that of diflubenzuron. These compounds also had good larvicidal activities against diamondback moth and mosquito; most of these target compounds exhibited comparable larvicidal activities of diamondback moth with diflubenzuron and higher larvicidal activities of mosquito than diflubenzuron.
Conclusion: The experimental data above preliminarily proved the rationality of our speculation and design ideology, and BPUs analogues with a bipartite model could improve the interaction with the target.
Keywords: Benzoylureas, bipartite model, carbamate, insecticidal, sulfonylurea receptor, binding site.
[http://dx.doi.org/10.1002/arch.10113] [PMID: 14635177]
[http://dx.doi.org/10.1093/jee/80.1.29]
[http://dx.doi.org/10.1007/BF00623561] [PMID: 4772134]
[http://dx.doi.org/10.1016/0048-3575(74)90073-X]
[http://dx.doi.org/10.1016/0022-1910(78)90103-8]
[http://dx.doi.org/10.1016/0020-1790(79)90009-X]
[http://dx.doi.org/10.1016/0048-3575(80)90064-4]
[http://dx.doi.org/10.1016/0048-3575(81)90083-3]
[http://dx.doi.org/10.1016/0048-3575(82)90141-9]
[http://dx.doi.org/10.1242/jeb.00709] [PMID: 14610026]
[http://dx.doi.org/10.1016/0965-1748(92)90101-J]
[http://dx.doi.org/10.1016/S0965-1748(96)00048-3] [PMID: 9014334]
[http://dx.doi.org/10.1016/j.ibmb.2004.03.009] [PMID: 15262279]
[http://dx.doi.org/10.1002/ps.3476] [PMID: 23441090]
[http://dx.doi.org/10.2174/1570180813666160818153617]
[http://dx.doi.org/10.2174/1381612054546879] [PMID: 16101450]
[http://dx.doi.org/10.1124/jpet.107.123224] [PMID: 17495126]
[http://dx.doi.org/10.1096/fj.06-6730hyp] [PMID: 17110465]
[http://dx.doi.org/10.1093/jee/18.2.265a] [PMID: 3333059]
[http://dx.doi.org/10.1021/jf900324a] [PMID: 19326865]
[http://dx.doi.org/10.1002/1526-4998(200009)56:9<743::AID-PS195>3.0.CO;2-8]
[http://dx.doi.org/10.1021/jf063564g] [PMID: 17348679]
[http://dx.doi.org/10.1046/j.1420-9101.1994.7030315.x]