Curtius rearrangement of the 4-azide of 5-(tri-O-benzyl-β-D-ribofuranosyl)pyrazole-3,4-dicarboxylic acid gave the N-carboxy-anhydride of the 4-amino-3-acid the methyl ester of which, on heating in formamide followed by catalytic hydrogenolysis, gave formycin B.
E. M. Acton, K. J. Ryan, D. W. Henry and L. Goodman, J. Chem. Soc. D, 1971, 986 DOI: 10.1039/C29710000986
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