Download MendeleyDesign, Synthesis, and Bioactivity of Triketone-quinoxalin-2-ones as a Novel HPPD Inhibition Herbicide.
Cai, Z.M., Ying, R.N., Wang, X.Q., Bai, R.Y., Sun, A., Kandegama, W., Lin, H.Y., Wang, D.W., Yang, G.F.(2025) J Agric Food Chem 73: 27328-27337
- PubMed: 41100756
- DOI: https://doi.org/10.1021/acs.jafc.5c08188
- Primary Citation Related Structures:
9JS2 - PubMed Abstract:
4-Hydroxyphenylpyruvate dioxygenase (HPPD) is recognized as one of the most promising herbicide targets for sustainable weed control in modern agricultural practices. To address agricultural demands, we designed and synthesized a novel series of triketone-quinoxalin-2-ones as potent HPPD inhibitors. In vitro evaluation revealed that the newly synthesized compounds demonstrated remarkable Arabidopsis thaliana HPPD ( At HPPD) inhibitory activity. Significantly, compound 23 , 3-(4-chloro-2-fluorophenyl)-6-(2-hydroxy-6-oxocyclohex-1-ene-1-carbonyl)-1,5-dimethylquinoxalin-2(1 H )-one, showed the strongest At HPPD inhibition with an IC 50 value of 0.034 μM, 10-fold more potent than mesotrione (IC 50 = 0.350 μM). Furthermore, the postemergence herbicidal activity evaluation showed that compound 35 exhibited 100% inhibition of Digitaria sanguinalis , Amaranthus retroflexus , Chenopodium serotinum , and Abutilon theophrasti at 150 g ai/ha, and 90% inhibition of Setaria viridis , showing enhanced activity compared to mesotrione. The crystal structure of the At HPPD -35 complex demonstrated that compound 35 engaged in a key bidentate chelating interaction with the metal ion in the catalytic active site and a π-π interaction with Phe381 and Phe424. Moreover, 35 established hydrophobic interactions with Leu427, Leu368, and Met335. These results indicate that the triketone-quinoxalin-2-one hybrid is a promising scaffold and 35 can be considered a viable lead compound for the development of HPPD inhibitors.
- State Key Laboratory of Green Pesticide, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China.
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