The title compound (2) was found to undergo a (2 + 4) cycloaddition with 2,3-dimethylbuta-1,3-diene affording the tetrahydro-1,2-benzisoxazole (3), which could be easily converted into the corresponding dihydro derivative (4) by elimination of the NO2 and CO2Et groups.
Difunctionalized 4-Nitroisoxazoles as Synthetic Equivalents of the Corresponding 4,5-Didehydroderivative in [2 + 4] Cycloadditions with 2,3-Dimethylbuta-1,3-diene: Reductive Eliminations of the Activating Groups from the Primary Adducts