Highly efficient fixation of carbon dioxide into 2-oxazolidinones under mild conditions by using a reusable ionic liquid/CuI catalyst system.

A green approach was proposed for fixing CO 2 with high efficiency and minimal energy consumption to produce 2-oxazolidinones through a one-pot reaction under mild conditions. A catalytic system composed of CuI and the ionic liquid [BMMIM][PF 6 ] was employed, resulting in excellent yields. The starting materials, amines, aldehydes, and alkynes, with various substituents were investigated. The ionic liquid [BMMIM][PF 6 ] used in this study was easy to prepare and easy to recycle for repeated use.