The reaction of 3-unsubstituted isoxazolium salts with 1,2-dinucleophiles (hydroxylamine, hydrazine, methylhydrazine, phenylhydrazine, 4-nitrophenylhydrazine, semicarbazide) in boiling ethanol, affords 4-functionalized 3-alkylaminoisoxazoles and 3-alkylaminopyrazoles in high yields. The procedure is quite general, thus providing a new method for the synthesis of 3-aminoazoles with potential biological activity. Mechanistic pathways for these transformations are proposed.
未取代的3-异氧杂盐与1,2-双亲核试剂(
羟胺、
肼、消旋
肼、苯
肼、4-
硝基苯肼、半
脲)在沸腾的
乙醇中反应,能够高产率地生成4-功能化的3-烷基
氨基异氧杂烯和3-烷基
氨基
吡唑。这一方法相当通用,因此为合成具有潜在
生物活性的3-
氨基
杂环化合物提供了一种新方法。对这些转化的机制路径也进行了提出。