Catalytic hydrogenation of the oxime, semicarbazone, and phenylhydrazone of 2-nitrophenylpyruvic acid yields indole-2-carboxylic acid and 1-hydroxylindole-2-carboxylic acid. Similar reduction of the oxime of ethyl 2-nitrophenylpyruvate yields a mixture of ethyl indole-2-carboxylate and 3-amino-1-hydroxy-1H-quinolin-2-one.
I. Baxter and G. A. Swan, J. Chem. Soc. C, 1967, 2446 DOI: 10.1039/J39670002446
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