Palladium-Catalyzed Synthesis of Symmetrical and Unsymmetrical Ureas Using Chromium Hexacarbonyl as a Convenient and Safe Alternative Carbonyl Source
作者:Mozhdeh Mozaffari、Najmeh Nowrouzi
DOI:10.1002/ejoc.201901273
日期:2019.12.15
Different symmetrical and unsymmetrical ureas can be synthesized through a Pd‐catalyzed carbonylation of aryl iodides using chromium hexacarbonyl. Curtius rearrangement occurs in the presence of sodium azide which is followed by nucleophilicaddition of different amines to afford the products in good to excellent yields.
Assembly of N,N-disubstituted-N′-arylureas via a copper-catalyzed one-pot three-component reaction of aryl bromides, potassium cyanate, and secondary amines
作者:Hongfei Yin、Bing Chen、Xiaojing Zhang、Xinye Yang、Yihua Zhang、Yongwen Jiang、Dawei Ma
DOI:10.1016/j.tet.2013.04.117
日期:2013.7
A three-component reaction of aryl bromides, potassiumcyanate, and secondary amines takes place at 110 °C in MeCN under the catalysis of Cu2O and 2-(2,6-dimethylphenylamino)-2-oxoacetic acid potassium salt, giving N,N-disubstituted-N′-arylureas in good to excellent yields. A number of functionalized aryl bromides and secondary amines were compatible with these conditions, and thereby providing a facile