1) Purines, pyrimidines, and imidazoles. Part XXXVI. Carboxylation of some 5-aminoimidazoles and related compounds, including nucleosides and nucleotides, with potassium hydrogen carbonate in aqueous solution
N. J. Cusack, G. Shaw and G. J. Litchfield
J. Chem. Soc. C, 1971, 1501 - 1507
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http://dx.doi.org/10.1039/J39710001501Hiroyasu Taguchi
Tetrahedron Letters
Volume 14, Issue 14, 1973, Pages 1137-1138
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http://dx.doi.org/10.1016/S0040-4039(01)95777-6