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.
Lewis basic ionic liquids-catalyzed synthesis of 5-aryl-2-oxazolidinones from aziridines and CO2 under solvent-free conditions
作者:Zhen-Zhen Yang、Liang-Nian He、Shi-Yong Peng、An-Hua Liu
DOI:10.1039/c0gc00286k
日期:——
basic ionic liquids were developed as recyclable and efficient catalysts for selective synthesis of 5-aryl-2-oxazolidinones from aziridines and CO2 without utilization of any organic solvent or additive. Notably, high conversion, chemo- and regio-selectivity were attained when 1-butyl-4-aza-1-azaniabicyclo[2.2.2]octane bromide ([C4DABCO]Br) was used as the catalyst. Furthermore, the catalyst could be
Basic ion-exchangeresins, one kind of polystyryl-supported tertiary amine, were demonstrated to be highly efficient and recyclable catalysts for the fixation of carbon dioxide with aziridines under mild conditions, leading to the formation of 5-aryl-2-oxazolidinone with excellent regio-selectivities. Notably, neither solvents nor any additives were required, and the catalyst could be recovered by
efficiently promoted by ruthenium(VI) imidoporphyrin complexes and yields a mixture of 5‐aryl (A) and 4‐aryl (B) substituted oxazolidin‐2‐ones with a regioisomeric A/B ratio up to 99:1. Several oxazolidin‐2‐one molecules were synthesized at 100 °C and 0.6 MPa of carbondioxide by using the low catalytic loading of 1 mol‐%. The formation of a deactivated compound, deriving from the ruthenium catalyst, suggested