Chinese Journal of Organic Chemistry >
Design, Synthesis and Bioactivity of New Pyrimidyl-salicylate Inhibitors
Received date: 2019-01-26
Revised date: 2019-03-04
Online published: 2019-03-21
Supported by
Project supported by the National Key Research and Development Program of China (No. 2018YFD0200102) and the National Natural Science Foundation of China (Nos. 21837001. 21772058).
Acetohydroxyacid synthase (AHAS) was one of important herbicidal targets. However, the issue of weed resistance to commercial AHAS inhibitors has become one of the largest obstacles for their application. Therefore, there is a high demand to design new anti-resistance AHAS inhibitors. Herein, based on the reported low resistance AHAS inhibitors, a series of pyrimidyl-salicylates with "double oxygen bridge" utilized the "conformation flexibility analysis" strategy were designed. All the synthesized compounds were characterized by 1H NMR, 13C NMR and HRMS. The bioactivity results showed that most of the derivatives displayed good inhibitory activities against P197L mutant. Especially, 2-((4,6-dimethoxypyrimidin-2-yl)oxy)-6-(2-fluoro-4-nitrophenoxy)-4-methylbenzoic acid (6l) was identified as the most potent anti-resistance AHAS inhibitor. In addition, some compounds showed good weed control for resistant Descurainia sophia (P197L AHAS). Most importantly, 2-((4,6-dimethoxypyrimidin-2-yl)oxy)-6-(2-fluorophenoxy)-4-methylbenzoic acid (6b) showed 80% herbicidal activities against sensitive and resistant Descurainia sophia at the dosage of 150 g ai/ha. These results indicated that this type of compounds worth of the further investigation.
Qu Renyu , Yan Yaochao , Yang Jingfang , Chen Qiong , Yang Guangfu . Design, Synthesis and Bioactivity of New Pyrimidyl-salicylate Inhibitors[J]. Chinese Journal of Organic Chemistry, 2019 , 39(8) : 2303 -2310 . DOI: 10.6023/cjoc201901043
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