Design of task-specific ionic liquids for catalytic conversion of CO2 with aziridines under mild conditions
作者:Ya-Nan Zhao、Zhen-Zhen Yang、Si-Hang Luo、Liang-Nian He
DOI:10.1016/j.cattod.2012.04.006
日期:2013.2
were developed as recyclable and efficient catalysts for selective synthesis of 5-aryl-2-oxazolidinones from aziridines and CO2 without addition of any organic solvents or additives. In particular, high yields, chemo- and regio-selectivities of oxazolidinones were attained when BrDBNPEG150DBNBr (DBN: 1,5-diazabicyclo[4.3.0]non-5-ene) was used as the catalyst, presumably due to activation of CO2 by the
Protic onium salts-catalyzed synthesis of 5-aryl-2-oxazolidinones from aziridines and CO2 under mild conditions
作者:Zhen-Zhen Yang、Yu-Nong Li、Yang-Yang Wei、Liang-Nian He
DOI:10.1039/c1gc15581d
日期:——
Protic onium salts, e.g.pyridium iodide, proved to be highly efficient and recyclable catalysts for the selective synthesis of 5-aryl-2-oxazolidinones under a CO2 atmosphere at room temperature, presumably due to aziridine activation assisted by hydrogen bonding on the basis of 1H NMR and in situ FT IR under CO2 pressure study.
Naturally occurring α-amino acid: a simple and inexpensive catalyst for the selective synthesis of 5-aryl-2-oxazolidinones from CO2 and aziridines under solvent-free conditions
Naturally occurring α-amino acid successfully catalyzed cycloaddition of aziridine with carbon dioxide to afford 5-aryl-2-oxazolisinones under mild conditions without the need of any additives. The scope of this reaction is very general, providing the corresponding products in good yields and excellent regioselectivity (87:13–100:0) regardless of the α-amino acid examined and a wide variety of N-substituted
Polystyrene‐Supported Amino Acids as Efficient Catalyst for Chemical Fixation of Carbon Dioxide
作者:Chaorong Qi、Jinwu Ye、Wei Zeng、Huanfeng Jiang
DOI:10.1002/adsc.201000261
日期:2010.10.9
polystyrene-supported aminoacids have been synthesized and applied to the chemicalfixation of carbondioxide for the first time. Two series of experiments with polystyrene-supported threonine (PS-Thr) and polystyrene-supported tyrosine (PS-Tyr) as catalyst, respectively, were conducted to study the effect of the reaction conditions on the carboxylation of propylene oxide/carbondioxide. There was no considerable
Zirconyl chloride: an efficient recyclable catalyst for synthesis of 5-aryl-2-oxazolidinones from aziridines and CO2 under solvent-free conditions
作者:Ying Wu、Liang-Nian He、Ya Du、Jin-Quan Wang、Cheng-Xia Miao、Wei Li
DOI:10.1016/j.tet.2009.05.034
日期:2009.8
Zirconyl chloride was found to be an efficient catalyst for the cycloaddition reaction of aziridines with CO2, thus leading to the preferential formation of 5-aryl-2-oxazolidinones undersolvent-freeconditions. The methodology could be extended to various substituted aziridines with high conversion and chemo-, regio-, and stereoselectivity. Furthermore, the catalyst could be reused over five times