Preparation of Unsymmetrical Sulfonylureas from <i>N</i>,<i>N</i>‘-Sulfuryldiimidazoles
作者:Serge Beaudoin、Kenneth E. Kinsey、James F. Burns
DOI:10.1021/jo026505k
日期:2003.1.1
use in parallel synthesis. We have developed a method for preparing sterically congested sulfonylureas based on N,N'-sulfuryldiimidazole that is both convenient and amenable to parallel synthesis. Sequential activation by way of alkylation of the imidazole group using methyl triflate followed by nucleophilic displacement with a variety of amines and anilines afford the unsymmetrical sulfonylurea. Sulfonylureas
文献中报道的用于制备磺酰脲类的合成方法趋于在范围上受到限制或不适用于平行合成。我们已经开发了一种基于N,N'-磺酰基二咪唑制备空间拥挤的磺酰脲类的方法,该方法既方便又易于平行合成。通过使用三氟甲磺酸甲酯对咪唑基进行烷基化的顺序活化,然后用各种胺和苯胺进行亲核取代,得到不对称的磺酰脲。使用N,N'-磺酰基二咪唑可高收率地从苯胺制备磺酰脲,而在空间上更拥挤的类似物N,N'-磺酰基双-2-甲基咪唑则被证明对烷基胺而言是优越的。