title: Ionic liquid as an efficient promoting medium for fixation of carbon dioxide: a clean method for the synthesis of 5-methylene-1,3-oxazolidin-2-ones from propargylic alcohols, amines, and carbon dioxide catalyzed by Cu(I) under mild conditions.
abstract: [reaction: see text] The reactions of propargylic alcohols, aliphatic primary amines, and CO2 were conducted in CuCl/[BMIm]BF4 system to produce the corresponding 5-methylene-1,3-oxazolidin-2-ones under relatively mild conditions. The products could be conveniently isolated by means of liquid-liquid extraction. The solvent ionic liquid as well as CuCl catalyst can be recovered and reused three times without appreciable loss of activity. By this green approach, several new 5-methylene-1,3-oxazolidin-2-ones were prepared in excellent yields and purity and were well-characterized.
authors.affiliation: Center for Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
authors.forename: Yanlong
authors.initials: Y
authors.lastname: Gu
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Zhang
authors.forename: Zhiying
authors.initials: Z
authors.lastname: Duan
authors.forename: Juan
authors.initials: J
authors.lastname: Zhang
authors.forename: Shiguo
authors.initials: S
authors.lastname: Zhang
authors.forename: Youquan
authors.initials: Y
authors.lastname: Deng