EN
Several new 3-substituted isoxazolecarboxamides have been prepared from aromatic and aliphatic aldehydes. A key step was a 1,3-dipolar cycloaddition of nitrile oxides to ethyl acrylate or methacrylate esters. Some of the amides showed high fungicidal activities against Alternaria alternate, Botrytis cinerea, Rhizoctonia solani, Fusarium culmorum, and Phytophthora cactorum strains.