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.

制备了几种Fe（II）配合物作为催化剂，用于从末端环氧化物，芳基胺和二氧化碳合成恶唑烷酮。DBU（1,8-二氮杂双环[5.4.0] undec-7-ene）被确定为恶唑烷酮形成的高活性助催化剂。机理研究表明，Fe（II）配合物充当了两个活性物质（包括路易斯酸和卡宾）的储存库。环氧化物通过路易斯酸的Fe原子与环氧化物的氧原子之间的Fe-Oσ键活化。同时，亲核卡宾活化CO ₂形成卡宾-CO ₂加合物。另外，路易斯酸与环氧化物之间的相互作用加速了环氧化物与芳基胺的反应。DBU在β-氨基醇和环状碳酸酯。在温和的反应条件下，在CO ₂的存在下，各种环氧化物和芳基胺均以良好的收率转化为相应的恶唑烷酮。