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
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.
Ga‐Catalyzed Temperature‐Dependent Oxazolidinone/Piperazine Synthesis from Phenyl Aziridines Involving a Divergent Ligand‐Assisted Mechanism
作者:Maria Distressa G. Billacura、Ryan D. Lewis、Neil Bricklebank、Alex Hamilton、Christopher J. Whiteoak
DOI:10.1002/adsc.202300537
日期:2023.9.19
of CO2 and aziridines to form oxazolidinones is presented. It has been possible to optimize the catalyst system for the selective formation of a single regioisomer, in excellent yield, under relatively mild reaction conditions. The optimized catalyst system has been successfully applied to a range of substituted aziridines derived fromstyrene oxide. It has been observed that aziridines bearing two