Imidazolium-2-carboxylates derived from N-heterocyclic carbenes (NHCs) and CO2 serve as efficient catalysts for CO2-carboxylation of tertiary aziridines bearing various substituents such as halogens, ether, olefin, ester, acetal, and nitro groups on the aziridine ring in 2-propanol, leading to 3-substituted-2-oxazolidones in good to excellent yields and with high selectivity. The NHC–CO2 adducts facilitate
咪唑-2-
羧酸盐衍生自 N-杂环卡宾(NHCs)和CO 2起到了有效的作用催化剂的CO 2-羧化
氮丙啶 带有各种取代基,例如 卤素, 醚, 烯烃, 酯,
乙缩醛,以及
氮丙啶环上的硝基 2-
丙醇,从而以高至优异的收率和高选择性产生3-取代的-2-
恶唑烷酮。NHC-CO 2加合物促进了CO 2部分对核素的亲核攻击。
氮丙啶,其中取代基在羧化过程中是完整的。这催化剂 成功回收了五次,没有明显的活性损失。