Synthesis of 4-Aryl-6-oxo-5-cyano-1,6-dihydropyridine-2-carboxylic Acids and Their Methyl Esters by Reacting Methyl Acylpyruvates with Malononitrile and Cyanoacetamide - Maryasov, M. A.; Romashov, N. P.; Davydova, V. V.; Nasakin, O. E.; Osipova, M. P. (Russian Journal of General Chemistry, 2021)