Carboxylation of terminal alkynes at ambient CO2 pressure in ethylene carbonate
作者:Bing Yu、Zhen-Feng Diao、Chun-Xiang Guo、Chun-Lai Zhong、Liang-Nian He、Ya-Nan Zhao、Qing-Wen Song、An-Hua Liu、Jin-Quan Wang
DOI:10.1039/c3gc40896e
日期:——
The CuI-catalyzed carboxylation of terminal alkynes with CO2 and alkyl halides using ethylene carbonate as the solvent under mild conditions was studied. DFT calculations reveal that the energy barrier for CO2 insertion into the sp-hybridized Cu–C bond could be reduced by employing ethylene carbonate as the solvent. Notably, the procedure was conducted under ambient CO2 pressure without any external ligands. A broad range of substrates with electron-withdrawing groups or electron-donating groups gave the corresponding products in reasonable yields.
Copper(I)-based ionic liquid-catalyzed carboxylation of terminal alkynes with CO2 at atmospheric pressure
作者:Jia-Ning Xie、Bing Yu、Zhi-Hua Zhou、Hong-Chen Fu、Ning Wang、Liang-Nian He
DOI:10.1016/j.tetlet.2015.11.028
日期:2015.12
An ionic liquid containing copper(I) proved to be an effective homogeneous catalyst for the carboxylation of terminal alkynes with ambient CO2. This developed procedure needs no external ligands and terminal alkynes with various groups proceeded smoothly at atmospheric CO2 pressure and room temperature. Interestingly, the ILs containing copper(I) in both the anion and the cation showed much higher
Copper(I)@Carbon-Catalyzed Carboxylation of Terminal Alkynes with CO<sub>2</sub> at Atmospheric Pressure
作者:Bing Yu、Jia-Ning Xie、Chun-Lai Zhong、Wei Li、Liang-Nian He
DOI:10.1021/acscatal.5b00764
日期:2015.7.2
Activated carbon supported CuBr was found to be an efficient catalyst for the carboxylation of terminal alkynes under atmospheric pressure of CO2 using ethylene carbonate as solvent at 80 degrees C for only 2 h, as verified with (CO2)-C-13. Various terminal alkynes could react smoothly with CO2 and organic halides under the reaction conditions to afford the corresponding carboxylic esters. In addition, the catalyst can be easily recovered and reused at least five times without significant loss of activity.