A sensitive amine-responsive disassembly of self-assembled AuI -CuI double salts was observed and its utilization for the synergistic catalysis was enlightened. Investigation of the disassembly of [Au(NHC)2 ][CuI2 ] revealed the contribution of Cu-assisted ligand exchange of N-heterocyclic carbene (NHC) by amine in [Au(NHC)2 ]+ and the capacity of [CuI2 ]- on the oxidative step. By integrating the
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。
[EN] METHOD FOR CATALYTICALLY ACTIVATING CARBON DIOXIDE AS CARBONYLATION REAGENT WITH INORGANIC SULFUR<br/>[FR] PROCÉDÉ POUR L'ACTIVATION CATALYTIQUE DE DIOXYDE DE CARBONE EN TANT QUE RÉACTIF DE CARBONYLATION AVEC DU SOUFRE INORGANIQUE<br/>[ZH] 无机硫催化活化二氧化碳作为羰基化试剂的方法
Manganese catalyzed urea and polyurea synthesis using methanol as C1 source
作者:Jiaxin Guo、Jun Tang、Hui Xi、Sheng-Yin Zhao、Weiping Liu
DOI:10.1016/j.cclet.2022.08.011
日期:2023.4
The manganese-catalyzed dehydrogenative coupling between methanol and amines for the synthesis of ureas and polyureas is described. Importantly, catalytic efficiency can be improved by the newly synthesized MACHO ligands. Furthermore, this highly atom-economical protocol demonstrates a broad substrate scope with good functional group tolerance, producing H2 as the sole byproduct. Mechanistic studies
描述了用于合成脲和聚脲的甲醇和胺之间的锰催化脱氢偶联。重要的是,新合成的 MACHO 配体可以提高催化效率。此外,这种高度原子经济的方案展示了广泛的底物范围和良好的官能团耐受性,产生 H 2作为唯一的副产物。机理研究表明,甲酰胺是通过锰催化胺与甲醇的甲酰化作用形成的。随后的脱氢提供了一种瞬时异氰酸酯,它被另一当量的胺攻击以提供最终产物。
Aminomethylation of Thiophene. II. The Intermediate N-(2-Thenyl)-formaldimines and their Reactions
作者:Howard D. Hartough、Seymour L. Meisel、Emil Koft、John W. Schick