The Reactions of 3-Unsubstituted Isoxazolium Salts with 1,2-Dinucleophiles. Synthesis of 4-Functionalized 3-Aminoisoxazoles and 3-Aminopyrazoles
作者:A. Alberola、L. F. Antolín、P. Cuadrado、A. M. González、M. A. Laguna、F. J. Pulido
DOI:10.1055/s-1988-27512
日期:——
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。