标题：Fe(II) complexes: Reservoirs for Lewis acids and carbenes and their utility in the conversion of CO2 to oxazolidinones
作者：Chen, Fei ;Li, Min ;Wang, Jingjing ;Dai, Bin ;Liu, Ning
作者机构：[Chen, Fei ;Li, Min ;Dai, Bin ;Liu, Ning ] School of Chemistry and Chemical Engineering, Key Laboratory for Green, Processing of Chemical Engineering 更多
来源：Journal of CO2 Utilization
摘要：Several Fe(II) complexes were prepared as catalysts for the synthesis of oxazolidinones from terminal epoxides, aryl amines, and carbon dioxide. DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) was identified as a highly active co-catalyst for the formation of oxazolidinones. Mechanistic studies reveal that Fe(II) complexes act as reservoirs of the two active species including Lewis acid and carbene. The epoxides were activated via a Fe-O σ-bond between the Fe atom of the Lewis acid and the oxygen atom of the epoxide. Simultaneously, a nucleophilic carbene activates CO2 to form a carbene-CO2 adduct. In addition, interactions between the Lewis acid and epoxides accelerate the reaction of epoxides with aryl amines. DBU plays a crucial role in the reaction between the β-amino alcohol and cyclic carbonate. Under mild reaction conditions, various epoxides and aryl amines were converted to the corresponding oxazolidinones with good yields in the presence of CO2.
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