Yadav, Ashok K.; Manju, Meera, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2006, vol. 45, # 12, p. 2770 - 2772
作者:Yadav, Ashok K.、Manju, Meera
DOI:——
日期:——
Quaternary Ammonium Bromide Functionalized Polyethylene Glycol: A Highly Efficient and Recyclable Catalyst for Selective Synthesis of 5-Aryl-2-oxazolidinones from Carbon Dioxide and Aziridines Under Solvent-Free Conditions
作者:Ya Du、Ying Wu、An-Hua Liu、Liang-Nian He
DOI:10.1021/jo800269v
日期:2008.6.1
A quaternary ammonium bromide covalently bound to polyethylene glycol (PEG, MW = 6000), i.e., PEG(6000)-(NBu3Br)(2), was found to be an efficient and recyclable catalyst for the cycloaddition reaction of aziridines to CO2 under mild conditions without utilization of additional organic solvents or cocatalysts. As a result, 5-aryl-2-oxazolidinone was obtained in high yield with excellent regioselectivity. The catalyst worked well for a wide variety of 1-alkyl-2-arylaziridines. Besides, the catalyst could be recovered by centrifugation and reused without significant loss of catalytic activity and selectivity.