Treatment of 3a, b with potassium fluoride in acetonitrile containing various olefins resulted in the formation of A2-isoxazolines 4a, b (Table I). The yields of cycloadduds thus obtained, even on the small scale employed, compare favorably with those reported using other methodologies. 2 Preliminary experiments have also indicated that 3a (but not 3b) thermolyzes in refluxing toluene to afford nitrile oxide. Thus a 57?% yield of 3-methyl-5-n- ...
