New methods for the synthesis of alkyl-substituted 6-oxo-3-cyano-1,4,5,6-tetrahydropyridine-2-thiolates and their derivatives

Condensation of formaldehyde or acetaldehyde with cyanothioacetamide and cyanoacetic ester in the presence of organic bases afforded 6-oxo-3,5-dicyano-4-R-1,4,5,6-tetrahydropyridine-2-thiolates (R=H, CH₃), which were utilized in the synthesis of substituted 2-alkylthiopyridones and thieno[2,3-b]pyridone. T. G. Shevchenko Lugansk State Pedagogical Institute, Lugansk 348011, Ukraine. N. D. Zelinskii Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 117913. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1381–1383, October, 1998.