Ruthenium-catalyzed synthesis of symmetrical N,N'-dialkylureas directly from carbon dioxide and amines
摘要:
Aliphatic and araliphatic primary amines react with carbon dioxide at 120-140-degrees-C in the presence of ruthenium complexes and terminal alkynes, especially propargyl alcohols, to directly afford N,N'-disubstituted symmetrical ureas. The alkyne ruthenium intermediate acts as a dehydrating reagent. This new and mild method avoids the classical use of carbonyl precursors like phosgene or isocyanates.
Visible light-promoted synthesis of ureas and formamides from amines and CO<sub>2</sub>
作者:Qian Zhang、Jing Hou、Yan Huang、Le-wu Zhan、Bin-dong Li
DOI:10.1039/d2cc00572g
日期:——
A divergent visible-light-induced Ph3P-promoted method for the synthesis of ureas and formamides from amines and CO2 is reported. Without external additions, a range of ureas could be directly accessed under ambient temperature and pressure. Using triisopropylsilanethiol as the hydrogen source, formamides could be produced.
报道了一种由胺和CO 2合成脲和甲酰胺的发散可见光诱导的Ph 3 P 促进方法。在没有外部添加的情况下,可以在环境温度和压力下直接获取一系列尿素。使用三异丙基硅烷硫醇作为氢源,可以生产甲酰胺。