The reductive formylation of cinnolines by heating with formic acid and formamide gives the corresponding 1-formamidoindole; cinnoline-4-carboxylic acid is decarboxylated during the reaction.
D. E. Ames and B. Novitt, J. Chem. Soc. C, 1970, 1700 DOI: 10.1039/J39700001700
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