Pd/C-Catalyzed Domino Synthesis of Urea Derivatives Using Chloroform as the Carbon Monoxide Source in Water
作者:Liang Wang、Hao Wang、Guiqing Li、Shuliang Min、Fangyuan Xiang、Shiqi Liu、Waigang Zheng
DOI:10.1002/adsc.201800954
日期:2018.12.3
A Pd/C‐catalyzed domino synthesis of symmetrical and unsymmetrical ureas from aryl iodides, sodium azide, amines and CHCl3 in water has been developed. This reaction proceeds with sequential carbonylation, Curtius rearrangement and nucleophilic addition. CHCl3 serves as a convenient and safe alternation of CO gas in the presence of KOH. A series of urea derivatives were obtained in moderate to good
已经开发了一种Pd / C催化由水中的芳基碘化物,叠氮化钠,胺和CHCl 3合成对称和不对称脲的多米诺骨牌。该反应以顺序的羰基化,Curtius重排和亲核加成进行。在KOH存在下,CHCl 3可作为一种方便,安全的CO气体替代气体。以中等至良好的产率获得了具有良好的官能团耐受性的一系列脲衍生物。此外,连续六次运行后,Pd / C催化剂很容易被回收,催化活性略有下降。