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The Influence of the Substituents for the Insecticidal Activity of N' -phenyl-N-methylformamidine Analogues against Two Spotted Spider Mite (Tetranychus urticae)  

Lee, Jae-Whang (Department of Applied Biology & Chemistry, College of Agriculture and Life Science, Chungnam National University)
Choi, Won-Seok (Department of Applied Biology & Chemistry, College of Agriculture and Life Science, Chungnam National University)
Lee, Dong-Guk (Moghu Research Center Ltd.)
Chung, Kun-Hoe (Moghu Research Center Ltd.)
Ko, Young-Kwan (Korea Research Institute of Chemical Technology)
Kim, Tae-Joon (Dongbu Advanced Research Institute)
Sung, Nack-Do (Department of Applied Biology & Chemistry, College of Agriculture and Life Science, Chungnam National University)
Publication Information
The Korean Journal of Pesticide Science / v.14, no.4, 2010 , pp. 319-325 More about this Journal
Abstract
To understand the influences of the substituents ($R_1{\sim}R_4$) on insecticidal activity of N'-phenyl-N-methylformamidine analogues (1~22) against two spotted spider mite (Tetranychus urticae), comparative molecular field analysis (CoMFA) model and comparative molecular similarity indices analysis (CoMSIA) model as three dimensional quantitative structure-activity relationships (3D-QSARs) model were derived and discussed quantitatively. From the results, the correlativity and predictability ($r^2{_{cv.}}=0.575$ and $r^2{_{ncv.}}=0.945$) of the CoMFA 1 model were higher than those of the rest models. The the CoMFA 1 and CoMSIA 1 model with the sensitivity of the perturbation and the prediction produced ($d_q{^{2 & $q^2=0.545{\sim}0.626$) by a progressive scrambling analysis were not dependent on chance correlation. The insecticidal activities from the optimized CoMFA 1 model were depend upon the steric field (62.5%), electrostatic field (28.9%), and hydrophobic field (8.6%) of N'-phenyl-N-methylformamidine analogues. Therefore, the inhibitory activities with optimized CoMFA 1 model were dependent upon steric factor. From the contour maps of the optimized models, it is predicted that the structural distinctions that contribute to the insecticidal activity will be able to applied new potent insecticides design.
Keywords
3D-QSARs (CoMFA and CoMSIA) analysis; insecticidal activity; N'-phenyl-N-methylformamidine analogues; two spotted spider mites (Tetranychus urticae);
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