Synthesis of spiroisoxazolines through cycloadditions of nitrile oxides with 3-methylenequinuclidine

Four spiroisoxazolines have been prepared, by cycloaddition of aceto-, pivalo-, benzo- and mesito-nitrile oxide with 3-methylenequinuclidine. The reactions were completely regioselective, within the limits of detection. None of the isoxazolines showed significant inhibition of acetylcholinesterase.