Add time:09/05/2019 Source:sciencedirect.com
A simple and efficient synthetic protocol for 5-(3-indolyl)-oxazoles has been developed and further used to synthesize a series of novel analogues of natural product pimprinine (cas 13640-26-1). All new compounds were identified by 1H NMR, high resolution mass spectrometry, and the structures of 10 and 18o were further confirmed by X-ray crystallographic diffraction analysis. Bioassay conducted at Syngenta showed that several of the synthesized compounds exhibited fungicidal activity. Compounds 10, 17, 18h, 18o, 19h, 19i and 19l all showed effective control of three out of the seven tested phytopathogenic fungi at the highest rate screened. Compounds 17 and 19h in particular showed activity against the four pathogens screened in artificial media; Pythium dissimile, Alternaria solani, Botryotinia fuckeliana and Gibberella zeae.
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