- Synthesis of novel 3-chloropyridin-2-yl-pyrazole derivatives and their insecticidal, fungicidal activities and QSAR study
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In our early study, a series of anthranilic diamides containing acylthiourea linker (C) was reported to display favorable activities. Based on that research, four series of novel pyridylpyrazole derivatives (D-G) derived from C were designed and synthesized. Totally 24 compounds were synthesized and all the compounds were characterized by melting points, 1H NMR, 13C NMR and HRMS. Bioassay results indicated that compounds 5b, 5c and 6b showed 100 % insecticidal activities against oriental armyworm (Mythimna separata) at 200mg/L. Their fungicidal activities against A. solani, F. graminearum, P. capsici, S. sclerotiorum, B. cinerea and R. solani were evaluated and the results indicated that compounds 7a-g which contained acylguanidine linker showed favourable antibacterial activity against B. cinerea, among which 7d and 7f showed 97.5 % inhibitory activities against B. cinerea at 50mg/L. To further explore the comprehensive structure-activity relationship on the basis of insecticidal activity data, comparative molecular field analysis (CoMFA) was performed, and a statistically reliable model with good predictive power (r2 = 0.972, q2 = 0.604) was achieved.
- Zhang, Ji-Feng,Liu, Chen,Ma, Yi,Wang, Bao-Lei,Xiong, Li-Xia,Yu, Shu-Jing,Li, Zheng-Ming
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p. 497 - 506
(2013/07/26)
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- Synthesis and insecticidal activities of novel anthranilic diamides containing acylthiourea and acylurea
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Two series of anthranilic diamides containing acylthiourea and acylurea linkers were designed and synthesized, with changed length and flexibility of the linkers to compare to known anthranilic diamide insecticides. In total, 26 novel compounds were synthesized, and all compounds were characterized by 1H nuclear magnetic resonance and high-resolution mass spectrometry. Their insecticidal activities against oriental armyworm (Mythimna separata), mosquito larvae (Culex pipiens pallens), and diamondback moth (Plutella xylostella) were evaluated. The larvicidal activities against oriental armyworm indicated that the introduction of acylthiourea into some structures could retain their insecticidal activity; 8 of the 15 compounds (13a-13e, 14a-14e, and 15a-15e) exhibited 100% larvicidal activity at 10 mg/L. However, the introduction of acylurea decreased the insecticidal activity; only 3 of the 11 compounds (17a-17k) exhibited 100% larvicidal activity at 200 mg/L. The whole-cell patch-clamp technique indicated that compound 13b and chlorantraniliprole exhibited similar effects on the voltage-gated calcium channel. The calcium-imaging technique was also applied to investigate the effects of compounds 13b and 15a on the intracellular calcium ion concentration ([Ca2+]i), which indicated that they released stored calcium ions from endoplasmic reticulum. Experimental results denoted that several new compounds are potential activators of the insect ryanodine receptor (RyR).
- Zhang, Ji-Feng,Xu, Jun-Ying,Wang, Bao-Lei,Li, Yu-Xin,Xiong, Li-Xia,Li, Yong-Qiang,Ma, Yi,Li, Zheng-Ming
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p. 7565 - 7572
(2012/10/18)
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