X=Y–ZH Systems as potential 1,3-dipoles. Part 53: Sequential nucleophilic ring opening-1,3-dipolar cycloaddition reactions of Z-oxime anions with aziridines and dipolarophiles

Nucleophilic ring opening of aziridines involving attack of the nitrogen atom of Z-oxime anions generates nitrones which are then trapped in 1,3-dipolar cycloaddition reactions with N-methylmaleimide to afford 1:1 mixture of endo- and exo-cycloadducts.