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.
Catalyst-Free Process for the Synthesis of 5-Aryl-2-Oxazolidinones via Cycloaddition Reaction of Aziridines and Carbon Dioxide
作者:Liang-Nian He、Xiao-Yong Dou、Zhen-Zhen Yang、Jing-Lun Wang
DOI:10.1055/s-0030-1258510
日期:2010.9
A simple approach for facile synthesis of 5-aryl-2-oxazolidinones in excellent regioselectivity from aziridines under compressed CO2 conditions was developed in the absence of any catalyst and organic solvent. The reaction outcome was found to be tuned by subtly adjusting CO2 pressure. The adduct formed in situ of aziridine and CO2 is assumed to act as a catalyst in this reaction, which was also studied by means of in situ FT-IR technique.