The 5-amino-3-arylamino-1,2,4-oxadiazoles 2 are conveniently prepared by oxidative cyclization of the arylamidinoureas 10. The process is also capable of producing a variety of the 5-substituted-amino analogs 32 when the appropriately substituted guanidine 31 is employed as the substrate. Two different types of rearrangement leading to triazol-3-ones accompany cyclization depending on the choice of
通过
氨基芳基
尿素10的氧化环化,可以方便地制备5-
氨基-3-芳基
氨基-
1,2,4-恶二唑2。当使用适当取代的
胍31作为底物时,该方法还能够产生多种5-取代的
氨基类似物32。取决于原料的选择,导致三唑-3-酮的两种不同类型的重排伴随环化。通过X射线晶体学分析确定了重排产物的结构,并讨论了导致这些意外产物的反应机理。