Chemistry of Heterocyclic Compounds p. 517 - 521 (1986)
Update date:2022-08-05
Topics:
Krauze, A. A.
Liepin'sh, E. E.
Pelcher, Yu. E.
Kalme, Z. A.
Dubur, G. Ya.
Condensation of 2-cyano-3-pyridylthioacrylamides with esters of acetoacetic or β-aminocrotonic acids yields betaines of 3,5,6-substituted-4-pyridyl-3,4-dihydropyridine-2-thiones(1H).The spectral characteristics of the betaines have been examined and their ionization constants (pK) determined.
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