Protonated Porphyrins: Bifunctional Catalysts for the Metal-Free Synthesis of N-Alkyl-Oxazolidinones |
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Authors: | Matteo Cavalleri Dr Caterina Damiano Dr Dr Gabriele Manca Prof Emma Gallo |
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Institution: | 1. Department of Chemistry, University of Milan, Via C. Golgi 19, 20133 Milan, Italy;2. Istituto di Chimica dei Composti OrganoMetallici, ICCOM-CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy |
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Abstract: | The protonation of commercially available porphyrin ligands yields a class of bifunctional catalysts able to promote the synthesis of N-alkyl oxazolidinones by CO2 cycloaddition to corresponding aziridines. The catalytic system does not require the presence of any Lewis base or additive, and shows interesting features both in terms of cost effectiveness and eco-compatibility. The metal-free methodology is active even with a low catalytic loading of 1 % mol, and the chemical stability of the protonated porphyrin allowed it to be recycled three times without any decrease in performance. In addition, a DFT study was performed in order to suggest how a simple protonated porphyrin can mediate CO2 cycloaddition to aziridines to yield oxazolidinones. |
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Keywords: | aziridine carbon dioxide density functional calculations oxazolidinone porphyrins |
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