Synthesis, fungicidal activity and structure-activity relationships of 3-benzoyl-4-hydroxylcoumarin derivatives

Autor: Xue-Wen Hua, Yuan-Yuan Tao, Kang Lei, Chui-Hua Kong, Dong-Wei Sun, Xiaohua Xu
Rok vydání: 2015
Předmět:
Zdroj: Pest Management Science. 72:1381-1389
ISSN: 1526-498X
Popis: BACKGROUND To develop a coumarin-based fungicide, a series of 3-benzoyl-4-hydroxylcoumarin derivatives were synthesised and their fungicidal activities were evaluated against typical fungi occurring in Chinese agroecosystems. RESULTS Target compounds were characterised through 1H NMR, 13C NMR and high-resolution mass spectrometry. The crystal structure of compound III-21 was determined through X-ray diffraction. Bioassay results indicated that most of the target compounds showed good growth inhibition against all of the fungi tested in vitro. EC50 of the target compounds against Physalospora piricola, Rhizoctonia cerealis, Sclerotinia sclerotiorum and Botrytis cinerea indicated that most of the target compounds displayed comparable activity with that of carbindazim and chlorothalonil in vitro. Among these compounds, the analogue 3-(2-bromo-4-chlorobenzoyl)-4-hydroxylcoumarin (III-21) displayed the optimum growth inhibition against R. cerealis (87.5%) and B. cinerea (82.7%) in vivo at 200 µg mL−1 concentration; thus, this analogue is a potential inhibitor of pathogenic fungi and a new major compound for further optimisation. The results of analysing the structure–activity relationships demonstrated that changes in substituents on benzene ring A of 3-benzoyl-4-hydroxylcoumarin caused different fungicidal activities and provided original information on the preferential conformation to maintain high activities. CONCLUSION The present work demonstrated that 3-benzoyl-4-hydroxylcoumarin derivatives can be used as possible major compounds to develop novel fungicides. © 2015 Society of Chemical Industry
Databáze: OpenAIRE
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