Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 18, Issue 22, Pages 7948-7956Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2010.09.036
Keywords
Protoporphyrinogen oxidase; Herbicide; N-Phenyl pyrrolidin-2-one; N-Phenyl-1H-pyrrol-2-one; CoMFA
Funding
- National Basic Research Program of China [2010CB126103]
- NSFC [20925206, 20932005, 21002038]
- PCSIRT [IRT0953]
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The characteristics of low application rates, good crop selectivity, low residue and environmental safety exhibited by Protoporphyrinogen oxidase (PPO, EC 1.3.3.4)-inhibiting herbicides have attracted a world-wide research interests. As continuation of our research work on the development of new PPO inhibitors, a series of mono-carbonyl analogues of cyclic imides, N-phenyl pyrrolidin-2-ones and N-phenyl-1H-pyrrol- 2-ones, were designed and synthesized based on previously established DFT-QSAR results. The PPO inhibition activities of 29 newly synthesized compounds were tested and a predictive comparative molecular field analysis (CoMFA) model was established with the conventional correlation coefficient r(2) = 0.980 and the cross-validated coefficient q(2) = 0.518. According to the CoMFA model, the substituent effects on the PPO inhibition activity were explained reasonably. Further greenhouse assay showed that 2-(4-chloro-2-fluoro-5-propoxy-phenyl)-2,3,4,5,6,7-hexahydro-isoindol-1-one (C-6, k(i) = 0.095 mu M) and 2-(5-allyloxy-4-chloro-2-fluorophenyl)-2,3,4,5,6,7-hexahydro-isoindol-1-one (C-7, k(i) = 0.12 mu M) displayed excellent post-emergency herbicidal activity at the concentration of 150 g.ai/ha against seven tested weeds. Due to their high PPO inhibition effect and broad spectrum herbicidal activity, these two compounds have the potential for further study on crop selectivity and field trial. These results confirmed once again that only one of the carbonyl groups of cyclic imides is essential to the PPO inhibition activity. (C) 2010 Elsevier Ltd. All rights reserved.
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