3-Arylisoxazol-5-ones and 5-arylisoxazol-3-ones were prepared and converted to the N-methyl and O-methyl derivatives by reaction with diazomethane. The halogen in 3-phenyl-5-chloroisoxazole was replaced by several alkoxy and thioalkoxy groups. The 3,5-disubstituted isoxazoles thus obtained reacted with n-butyllithium to form the 4-lithio derivatives, as shown by conversion to 4-carboxylic acids and 4-iodocompounds. 3-Methoxy-5-phenylisothiazole was also lithiated at the 4-position.
3-芳基异噁唑-5-酮和5-芳基异噁唑-3-酮通过与重氮甲烷反应制备并转化为N-甲基和O-甲基衍生物。 3-苯基-5-氯异噁唑中的卤素被若干烷氧基和硫代烷氧基基团取代。得到的3,5-二取代异噁唑与正丁基锂反应形成4-锂衍生物,通过转化为4-羧酸和4-碘化合物得到证实。3-甲氧基-5-苯基异硫唑也在4-位进行锂化。