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.
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
Proline-Catalyzed Synthesis of 5-Aryl-2-oxazolidinones from Carbon Dioxide and Aziridines Under Solvent-Free Conditions
作者:Xiao-Yong Dou、Liang-Nian He、Zhen-Zhen Yang
DOI:10.1080/00397911.2010.521903
日期:2012.1.1
Natural alpha-amino acids were proven to be ecofriendly and recyclable catalysts for the carboxylation of aziridines with CO2 without utilization of any organic solvents or additives. Notably, a series of 5-aryl-2-oxazolidinones were obtained in good yield together with excellent chemo- and regioselectivity under mild conditions using proline as the catalyst. Notably, the catalyst could be recycled more than five times after a simple separation procedure without appreciable loss of catalytic activity. This process represents a promising strategy for homogeneous catalyst recycling.