CO2 insertion into C-N bonds

Incorporation of carbon dioxide into the aziridine ring gives oxazolidin-2-ones (4.35) [83, 155-174]. 

This reaction can proceed in the absence of any added catalyst, either under drastic conditions (393 K, 9 MPa, 24 h) [155] or, by using high speed ball milling (HBSM), at room temperature, under 

The cycloaddition reaction can be promoted by a variety of catalysts. Depending on the used catalytic system, different typologies of mechanisms can be categorized. 

Cycloaddition of CO2 with A -substituted phenylaziridines can be promoted by l,3-bis-(2,6-diisopropylphenyl)imidazol-2-ylidene (IPr) functionalized MCM-41 (MCM-41-lPr) [172]. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that MCM-41-IPr was able to capture CO2 reversibly to give an MCM-41-IPr-C02 adduct. 

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