Efficient and Recyclable Cobalt(II)/Ionic Liquid Catalytic System for CO
<sub>2</sub>
Conversion to Prepare 2‐Oxazolinones at Atmospheric Pressure
作者:Zhi‐Hua Zhou、Kai‐Hong Chen、Liang‐Nian He
DOI:10.1002/cjoc.201900346
日期:2019.12
propargylic amine and CO2 to prepare 2‐oxazolinones. In this protocol, various propargylic amines were successfully transformed into the corresponding 2‐oxazolinones with CoBr2 and diethylimidazolium acetate ([EEIM][OAc]) as the catalyst under atmospheric CO2 pressure. It is worthnoting that the turnover number (TON) of this transformation can be up to 1740, presumably being attributed to the cooperative
Valorization of CO<sub>2</sub>: Preparation of 2-Oxazolidinones by Metal–Ligand Cooperative Catalysis with SCS Indenediide Pd Complexes
作者:Paul Brunel、Julien Monot、Christos E. Kefalidis、Laurent Maron、Blanca Martin-Vaca、Didier Bourissou
DOI:10.1021/acscatal.7b00209
日期:2017.4.7
secondary propargylamines bearing tertiaryalkyl groups at nitrogen, primary propargylamines, and propargylanilines. Thorough experimental (NMR) and computational (DFT) investigations were undertaken to gain mechanistic insights. Accordingly, (i) the resting state of the catalytic cycle is a Pd DMSO complex; (ii) the indenediide backbone and Pd center act in concert to activate the carbamic acid intermediate
捕获和利用CO 2制备高价值化合物在化学上是非常有吸引力的,在社会上是非常合乎需要的。此处显示的基于茚二酮的Pd SCS钳形配合物可在温和的条件下(0.5-1 bar CO 2)促进炔丙基胺的羧基环化反应,生成2-恶唑烷酮,DMSO,40–80°C,1-5 mol%的Pd负载)。茚二酮Pd配合物与已知的催化剂竞争。事实证明,它可用于各种炔丙基胺,包括迄今具有挑战性的底物,例如在氮原子上带有叔烷基的仲炔丙基胺,伯炔丙基胺和炔丙基苯胺。进行了彻底的实验(NMR)和计算(DFT)研究,以获取机械方面的见解。因此,(i)催化循环的静止状态是Pd DMSO络合物;(ii)茚二酮主链和Pd中心共同作用以激活氨基甲酸中间体并促进其环化;(iii)质子穿梭对于降低初始胺羧化的活化势垒以及在Pd的配体主链与有机片段之间的质子转移是必不可少的。
Construction of the Oxazolidinone Framework from Propargylamine and CO<sub>2</sub>
in Air at Ambient Temperature: Catalytic Effect of a Gold Complex Featuring an L<sub>2</sub>
/Z-Type Ligand
The carboxylation of propargylamines with aerial CO2 at room temperature to form 5‐methyleneoxazolidin‐2‐one derivatives has been developed by using a gold catalyst featuring a Z‐type ligand.
Binuclear Tridentate Hemilabile Copper(I) Catalysts for Utilization of CO<sub>2</sub> into Oxazolidinones from Propargylic Amines
作者:Fei Chen、Sheng Tao、Qian-Qian Deng、Donghui Wei、Ning Liu、Bin Dai
DOI:10.1021/acs.joc.0c02065
日期:2020.12.4
Four binuclear tridentate copper(I) complexes were synthesized based on the trans effect of the hybrid ligands. The catalytic performance and behavior of the prepared copper(I) complexes were evaluated in the carboxylative cyclization of propargylic amines with CO2. The combined use of copper(I) complexes and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) provided a catalytic system for the synthesis of
基于杂合配体的反式作用,合成了四种双核三齿铜(I)配合物。制备的铜(I)配合物的催化性能和行为在炔丙基胺与CO 2的羧基环化反应中进行了评估。铜(I)配合物和1,5,7-三氮杂双环[4.4.0] dec-5-ene(TBD)的组合使用为从各种炔丙基胺和CO 2合成各种恶唑烷酮提供了催化体系在温和的反应条件下(室温—40°C和1 bar CO 2)。该协议成功的关键因素是使用具有N-杂环卡宾和氮供体之间具有半不稳定性质的铜配合物。NMR测量,密度泛函理论(DFT)计算以及有关镍配合物配位行为的先前报道均支持N-杂环卡宾与氮供体之间反式作用的存在。
Synthesis of 2-oxazolidinone by N-heterocyclic carbene-catalyzed carboxylative cyclization of propargylic amine with CO2
By employing N-heterocyclic carbenes as catalysts, the carboxylative cyclization of propargylicamine proceeded under 0.6 MPa of CO2 to afford the corresponding 2-oxazolidinone at 90 °C in 2-propanol. Among N-heterocyclic carbenes, 1,3-di-t-butylimidazol-2-ylidene was the most effective catalyst for the reaction, providing 2-oxazolidinone in a maximum chemical yield of 99%.