Safety of 4-Aminopyrimidine. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 4-Aminopyrimidine, is researched, Molecular C4H5N3, CAS is 591-54-8, about Design, synthesis and biological evaluation of pyrazole-aromatic containing carboxamides as potent SDH inhibitors.
To continue studies on discovery of new potent antifungal leads, 43 novel pyrazole-aromatic containing carboxamides were rationally designed and synthesized. Bioassays indicated that most target compounds displayed good in vitro antifungal activities against Botrytis cinerea, Rhizoctonia cerealis and Sclerotinia sclerotiorum and in vivo antifungal activity against R. solani. Compound I exhibited the most significant in vitro activity against R. cerealis (EC50 = 0.93μg/mL) with about 2-fold more potent than a previously reported lead compound N-(3-bromophenyl)-2-[3-(difluoromethyl)-1-methyl-1H-pyrazol-4-yl]-4-thiazolecarboxamide (EC50 = 2.01μg/mL), and about 11-fold more potent than the pos. control/com. succinate dehydrogenase inhibitor thifluzamide (EC50 = 23.09μg/mL). Structure-activity relationship anal. and mol. docking simulations indicated that the presence of difluoromethyl pyrazole-(m-benzene)carboxamide scaffold obviously increased the antifungal activity. The further enzymic bioassay showed that both thifluzamide and compound I displayed excellent SDH inhibitory effects, and fluorescence quenching anal. suggested that they may share the same target SDH.
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