phenyldiazonium fluoroborate to give iminium phenylhydrazone salts which, without isolation, can be converted by a base-catalysed reaction to imidazole derivatives. The latter reaction is critically dependent upon the nature of the base-component of the enamine ester. The mechanism of imidazole formation involves the following sequence of steps: (a) deprotonation of the iminium salt, (b) a symmetry-allowed 1
β-烯胺酯与
氟硼酸苯基重氮反应生成亚
氨基苯基hydr盐,该without盐无需分离即可通过碱催化反应转化为
咪唑衍
生物。后者的反应主要取决于烯胺酯的碱组分的性质。
咪唑形成的机理涉及以下步骤:(a)
亚胺盐的去质子化;(b)
甜菜碱中间体的对称允许的1,5-偶极环化作用;(c)随后消除
苯胺,并伴随芳香化作用。讨论了反应的范围,该方法是合成
咪唑衍
生物的简便方法。