Cyclic urethanes are obtained in good yields under mild conditions from amino alcohols and carbon dioxide using phosphorus(III) reagents [Ph3P, (PhO)3P, etc.] and halogenoalkanes (CCl4 and CCl3CCl3).
Y. Kubota, M. Kodaka, T. Tomohiro and H. (Yohmei) Okuno, J. Chem. Soc., Perkin Trans. 1, 1993, 5 DOI: 10.1039/P19930000005
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