Synthesis and Antifungal Activities of Furoxan Derivatives Designed as Novel Fungicide.

Furoxan derivatives 3-11 were designed and synthesized as potential fungicides. Symmetrically substituted furoxan derivatives 3a-j were prepared by dimerization of the corresponding nitrile oxide generated from N-hydroxyliminoyl chloride 2 in situ. Further functional group modifications of aldehyde 4, a key intermediate, generated furoxan derivatives 5-11. The fungicidal activities of furoxan derivatives 3-11 were observed over a broad spectrum of plant fungi at 250 ppm.