Design, Synthesis, and Structure–Activity Relationship of Novel Spiropyrimidinamines as Fungicides against Pseudoperonospora cubensis
- 22 May 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of Agricultural and Food Chemistry
- Vol. 68 (24), 6485-6492
- https://doi.org/10.1021/acs.jafc.9b07055
Abstract
Harmful-fugus and the developed resistance to available fungicides seriously threaten the yield and quality of crops, the search for new, highly efficient and resistance-overcoming fungicides remains a quite urgent goal to agricultural scientists. In this study, a series of novel spiro-pyrimidinamine derivatives were designed and synthesized by employing the intermediate derivatization method (IDM). Their structures were identified by 1H NMR, elemental analyses and MS spectra. The structure of compound 5 was further confirmed by X-ray diffraction. Bioassays indicated that a number of the title compounds exhibited some fungicidal activities against Pseudoperonospora cubensis. Especially compound 5 displayed excellent activity (EC50 = 0.42 mg/L), significantly higher than the commercialized fungicides cyazofamid, flumorph and diflumetorim. The structure-activity relationship was also discussed. It was concluded that compound 5 with super fungicidal potency and novel structure is a promising agrochemical fungicide candidate for further development.This publication has 24 references indexed in Scilit:
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