Metal-free synthesis of cyclic di-oxoguanidines via one-pot sequential transformation of amines, carbodiimides and acyl dichlorides
作者:Fei Zhao、Yang Wang、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1039/c2ob25799h
日期:——
The one-pot sequential reaction of various amines, carbodiimides, and acyl dichlorides has been achieved for the first time under metal-free conditions to provide symmetric cyclic di-oxoguanidines via an unexpected 2,2-dichloro-imidazolidindione intermediate. Acyl dichlorides have a dual function: to serve as the third component and to activate carbodiimides. In sharp contrast, the AlMe3-catalyzed sequential reaction from the same substrates gives the isomer.
首次在无金属条件下实现了多种胺、氨基卡宾和酰基二氯化物的一锅连续反应,生成了通过意想不到的2,2-二氯咪唑啉二酮中间体得到的对称环状二氧基古阿尼丁。酰基二氯化物具有双重功能:既作为第三组分,又激活氨基卡宾。与此形成鲜明对比的是,使用AlMe3催化的相同底物的连续反应则产出异构体。