1)Alan R. Katritzky, Ramiah Murugan, Kumars Sakizadeh
Depending on the conditions, and the basicity of the amine, arylamines react with chelidonic acid to yield five different types of product: salts, N-arylchelidamic acids, N-aryl-4-pyridone-2-carboxylic acids, N-aryl-4-pyridones, or chelidamic acid itself.
J Het Chem 1984, Volume 21, pp. 1465-1467
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https://www.jhetchem.com/cd2html.php?file=19841465Chromone studies. Part 5. Kinetics and mechanism of the reaction of 4-oxo-4H-chromene-2-carboxamides with dimethylamine
J. Chem. Soc., Perkin Trans. 2, 1991, 1509 - 1511
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http://dx.doi.org/10.1039/P29910001509