[graphics]An efficient one-step amination of cyclic amides and ureas has been developed. Treatment of cyclic amides and cyclic ureas with BOP in the presence of DBU in various solvents led to the formation of cyclic amidines and cyclic guanidines in good to excellent yields. Concise syntheses of biologically intriguing kinetin and potent kinase inhibitor olomoucin were thus achieved in just one and two steps, respectively.
The Scope and Mechanism of Phosphonium-Mediated S<sub>N</sub>Ar Reactions in Heterocyclic Amides and Ureas
作者:Zhao-Kui Wan、Sumrit Wacharasindhu、Christopher G. Levins、Melissa Lin、Keiko Tabei、Tarek S. Mansour
DOI:10.1021/jo7020373
日期:2007.12.1
An efficient “one-step” synthesis of cyclic amidines and guanidines has been developed. Treatment of cyclic amides and ureas with benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (BOP), base, and nitrogen nucleophiles leads to the formation of the corresponding cyclic amidines and guanidines, typically in good to excellent yields. This method has also been used to prepare heteroaryl