Design, Synthesis, and Biological Activity of Novel Heptacyclic Pyrazolamide Derivatives: A New Candidate of Dual-Target Insect Growth Regulators

作者：Biaobiao Jiang, Xiaoyu Jin, Yawen Dong, Bingbo Guo, Li Cui, Xile Deng, Li Zhang, Qing Yang, Yuxin Li, Xinling Yang, Guy Smagghe · 发表于：Journal of Agricultural and Food Chemistry · 年份：2020 · DOI：10.1021/acs.jafc.0c00522 · 被引用次数：34 · 研究领域：Studies on Chitinases and Chitosanases、Neurobiology and Insect Physiology Research、Invertebrate Immune Response Mechanisms

Insect growth regulators (IGRs) can cause abnormal growth and development in insects, resulting in incomplete metamorphosis or even death of the larvae. Ecdysone receptor (EcR) and chitinase in insects play indispensable roles in the molting process. Ecdysone analogues and chitinase inhibitors are considered as potential IGRs. In order to find new and highly effective IGR candidates, based on the structure–activity relationship and molecular docking results of the active compound 6i (3-( tert -butyl)- N -(4-( tert -butyl)phenyl)-1-phenyl-1 H -pyrazole-5-carboxamide) discovered in our previous work, we changed the t -butyl group on the pyrazole ring into heptacycle to enhance the hydrophobicity. Consequently, a series of novel heptacyclic pyrazolamide derivatives were designed and synthesized. The bioassay results demonstrated that some compounds showed obvious insecticidal activity. Especially, D-27 ( N -(4-( tert -butyl)phenyl)-2-phenyl-2,4,5,6,7,8-hexahydrocyclohepta[ c ]pyrazole-5-carboxamide) showed good activities against Plutella xylostella (LC 50, 51.50 mg·L –1 ) and Mythimna separata (100% mortality at 2.5 mg·L –1 ). Furthermore, protein validation indicated that D-27 acts not only on the EcR but also on chitinase Of ChtI. Molecular docking and molecular dynamics simulation explained the vital factors in the interaction between D-27 and receptors. D-27 may be a new lead candidate with a dual target in which Of ChtI shall be the main one. This work created a new starti...