A convenient route to bicyclic guanidines is reported starting from alkenylated monocyclic guanidines, which undergo intramolecular addition via aminomercuration. The dependence of the regioselectivity of the process on the type of educt is studied and a number of examples of regiospecific conduct are cited. It is shown that aminomercuration offers easy access to a number of hetero ring systems like imidazoimidazoles, imidazopyrimidines, imidazo- and pyrimidoquinazolines,imidazo- and pyrimidodiazepines as well as benzoxazepines. The method promises utility in the synthesis of a variety of other heterocycles.
报告中介绍了从烯化的单环
胍类化合物开始,通过
氨基肌肉化作用进行分子内加成,从而获得双环
胍类化合物的便捷途径。研究了该过程的区域选择性与诱导剂类型的关系,并列举了一些区域特异性传导的实例。研究表明,
氨酰胺化反应可以轻松地获得许多杂环系统,如
咪唑咪唑、
咪唑嘧啶、
咪唑喹唑啉和
嘧啶喹唑啉、
咪唑二氮杂卓和
嘧啶二氮杂卓以及苯并氧氮杂卓。该方法有望用于合成其他各种杂环。