Sulfated polyborate-catalyzed efficient and expeditious synthesis of (un)symmetrical ureas and benzimidazolones
作者:Deelip S. Rekunge、Chetan K. Khatri、Ganesh U. Chaturbhuj
DOI:10.1016/j.tetlet.2017.10.001
日期:2017.11
The excellent catalytic potential of sulfated polyborate is utilized in the synthesis of (un)symmetrical ureas and benzimidazolones by heating amines or substituted OPDA and urea or N-phenylureas under a solvent-free condition at 120 °C is described. The key advantages of the present protocol are phosgene-free, and other hazardous reagents or organic solvent free, high reaction rates and yields, simple
A fast and efficient protocol for the synthesis of N,N'-disubstituted urea derivatives from alkyl halides and primary or secondary amines has been developed. The synthetic pathway combines nucleophilic substitutions and a Staudinger-aza-Wittig reaction in the presence of polymer-bound diphenylphosphine under 14 bar of CO2 pressure and has been performed in a one-pot two-step process. The protocol has
已开发出一种快速有效的方案,用于从烷基卤化物和伯胺或仲胺合成 N,N'-二取代脲衍生物。合成途径结合了亲核取代和 Staudinger-aza-Wittig 反应,在聚合物结合的二苯基膦存在下,在 14 bar 的 CO2 压力下,并在一个一锅两步法中进行。该协议在微波辐射下进行了优化,放大实验是在帕尔反应器的常规条件下进行的。最终化合物在简单过滤后以几乎定量的总产率分离,这使得该过程容易且快速执行。
A High Yielding, One-pot Synthesis of Substituted Ureas from the Corresponding Amines Using Mitsunobu’s Reagent
A Mitsunobu -based protocol has been developed for the synthesis of symmetrically and unsymmetrically substituted ureas from a variety of primary and secondary amines using gaseous carbon dioxide, in good to excellent yields. This protocol is mild and efficient compared to other reported methods.
Citric acid stabilized on the surface of magnetic nanoparticles as an efficient and recyclable catalyst for transamidation of carboxamides, phthalimide, urea and thiourea with amines under neat conditions
and environmentally benign heterogeneous catalyst for the transamidation of carboxamides, phthalimide, urea and thiourea with amines. Several derivatives of formylated and transamidated products were synthesized in good to excellent yields in the presence of this catalytic system. And, the catalyst could be easily separated from the reaction mixture using an external magnet and can be reused six times
摘要成功制备并表征了柠檬酸包覆的磁性纳米粒子(Fe 3 O 4 -CA NPs)。该磁性纳米催化剂被用作一种高效,可回收且对环境无害的非均相催化剂,用于羧酰胺,邻苯二甲酰亚胺,尿素和硫脲与胺的氨基转移。在该催化体系的存在下,合成了甲酰化和酰胺化产物的几种衍生物,收率良好至优异。并且,可以使用外部磁体将催化剂容易地从反应混合物中分离出来,并且可以重复使用六次而不会显着降低其催化活性。 图形概要
[EN] METHOD OF CONVERTING CARBON DIOXIDE INTO CARBONYL COMPOUNDS<br/>[FR] PROCÉDÉ DE CONVERSION DE DIOXYDE DE CARBONE EN COMPOSÉS CARBONYLE
申请人:TRANSLATIONAL HEALTH SCIENCE AND TECH INSTITUTE
公开号:WO2019073484A1
公开(公告)日:2019-04-18
The present invention provides a method for fixing carbon dioxide gas as a carbonyl compound represented by formula (3) as depicted by Figure 1 and comprising, purging of carbon dioxide in a solution of a nucleophile represented by the formula (1) in presence of a solvent at a temperature ranging from -40 Degree Celsius to 35 Degree Celsius, followed by adding a reagent at temperature ranging from -40 degree to 35 degree and thereafter adding another nucleophile represented by the formula (2) to obtain carbonyl compound represented by formula (3). The present invention can be advantageously used to obtain commercially important carbonyl compounds and clean unwanted carbon dioxide gas from the atmosphere and industrial effluents.