Cycloadditions. Part 37. Molecular Mechanics Calculations and the Stereochemical Course of Intramolecular Dipolar Cycloadditions of Nitrile Oxides.

Treatment of the 1-(nitroalkyl)-2-vinylazetidines (V) and (X) with phenyl isocyanate results in the predominant formation of fused dihydroisoxazoles as outlined in the reaction scheme.