Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Structural Characteristics that Influence on the Insecticidal Activity of 2-(n-Octyl)pseudothiourea Analogues against the Diamondback Moth (Plutella xylostella, L.)

  • Soung, Min-Gyu (Department of Applied Biology and Chemistry, College of Agriculture and Life Science, Chungnam National University) ;
  • Kil, Mun-Jae (Department of Applied Biology and Chemistry, College of Agriculture and Life Science, Chungnam National University) ;
  • Sung, Nack-Do (Department of Applied Biology and Chemistry, College of Agriculture and Life Science, Chungnam National University)
  • Published : 2009.11.20
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Abstract

Structural characteristics that influence on the insecticidal activity ($pI_{50}$) of 2-(n-octyl)isothiourea analogues (1-45) against the diamondback moth (Plutella xylostella, L.) based on three dimensional quantitative structure activity relationships (3D-QSARs) were discussed quantitatively using a comparative molecular field analysis (CoMFA) and a comparative molecular similarity indeces analysis (CoMSIA) methods. The statistical values of the CoMFA 2 model were better than those of the CoMSIA 1 model. The CoMFA 2 model was the optimized model with the correlativity (the training set: Ave. = 0.104 & PRESS = 0.613) and the predictability (the test set: Ave. = 0.086 & PRESS = 0.096). Insecticidal activities with the optimized CoMFA 2 model were dependent upon steric factors (79.4%) of $R_1-R_3$ substituents. From the analytical results of CoMFA contour maps, it is predicted that the R1 substituent of 1-45 which has a steric favor in a broad space, $R_2\;and\;R_3$ groups with a steric favor in a narrow space and a H-bond donor favor would have better the insecticidal activity.

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