4,5-Dihydroisoxazoles by Copper(II)-Catalysed Condensation of Primary Nitroalkanes with Dipolarophiles

Primary aliphatic nitro compounds condense with substituted alkenes to give 4,5-dihydroisoxazoles under copper(II) acetate catalysis in the presence of tertiary amines. Apparently nitrile oxides are not intermediates, as no furoxans are detected in these reactions