Highly Selective Carboxylative Cyclization of Allenylmethylamines with Carbon Dioxide Using N-Heterocyclic Carbene-Silver(I) Catalysts
摘要:
Silver(I) carboxylate complexes promote the carboxylative cyclization of allenylmethylamines to afford 5-alkenyl-1,3-oxazolidin-2-ones in 2-propanol. The use of an N-heterocyclic carbene ligand (IPr) under pressurized CO2 is effective in suppressing the intramolecular hydroamination that leads to 2,5-dihydropyrroles. The mechanism involving a nucleophilic attack of the carbamate of the allene moiety and a subsequent protonation was realized on the basis of experimental and theoretical results involving a model intermediate, the alkenylgold(I) complex, which was synthesized from Au(OH)(IPr) and 1-methylamino-2,3-butadiene.
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
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。
PrVO4/SnD NPs as a Nanocatalyst for Carbon Dioxide Fixation to Synthesis Benzimidazoles and 2-Oxazolidinones
highly dynamic catalyst in the stabilization of CO2 for the production of 2-oxazolidinones and benzimidazoles. In addition, the catalyst is very easy to recycle and reuse without significant loss of active site Cu metal. PrVO4/SnD NPs as a nanocatalyst for carbondioxidefixation to synthesis benzimidazoles and 2-oxazolidinones.
20‐tetra(4‐pyridyl)porphyrin (TPyP‐H2) ligands to afford a robust 2D metal–organic framework (Ag27‐MOF). This silver cluster‐assembled material serves as a highly efficient heterogeneous catalyst for the cyclization of both terminal and internal propargylamines with CO2 under atmospheric pressure. Density functional theory (DFT) calculations illustrate that the high catalytic activity and broad substrate
Cu(II)-Catalyzed Phosphonocarboxylative Cyclization Reaction of Propargylic Amines and Phosphine Oxide with CO<sub>2</sub>
作者:Wen-Bin Huang、Fang-Yu Ren、Ming-Wei Wang、Li-Qi Qiu、Kai-Hong Chen、Liang-Nian He
DOI:10.1021/acs.joc.0c02172
日期:2020.11.6
protocol for straightforward access to a series of 5-((diarylphosphoryl)methyl)oxazolidin-2-ones via the copper-catalyzed difunctionalization of the C≡C bond of propargylic amines with CO2 and phosphine oxide. Notably, copper catalysis is a sustainable and benign catalytic mode. This reaction proceeds under mild reaction conditions, which is operationally simple and scalable with a broad scope, exclusive