A short and facile synthesis of a series of 2-aminoquinoline-3-carboxylic acid derivatives was accomplished in good yields via the intramolecular reductive cyclization of nitrocyano olefins promoted by TiCl4/Zn.
L. Zhou, S. Tu, D. Shi and G. Dai, J. Chem. Res. (S), 1998, 398 DOI: 10.1039/A800588E
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