Experimental study demonstrates metal-free synthesis of fluorinated isoxazoles with potent activity against Rhizoctonia solani, indicating their potential as agricultural fungicides.
We report that a Tf2O-mediated strategy enables cycloisomerization of 2-alkynone O-methyl oximes with fluorinated sulfoxides. This metal-free approach provides modular access to SCF2H/D or SeCF3-functionalized isoxazoles from simple precursors and features a broad substrate scope, including late-stage modification of bioactive molecules. Furthermore, all target compounds displayed antifungal activity against the four tested fungal strains with remarkable inhibitory potency toward Rhizoctonia solani.
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Xia et al. (2026) studied this question.
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