Generation of carbamate anions from either a primary or secondary amine, carbon dioxide and a stoichiometric amount of a pentaalkylguanidine followed by the addition of alkyl chlorides gives high yields of urethanes.
W. D. McGhee, Y. Pan and D. P. Riley, J. Chem. Soc., Chem. Commun., 1994, 699 DOI: 10.1039/C39940000699
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