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New method for the synthesis of 6-amino-4-aryl-3,5-dicyano-3,4-dihydropyridine-2(1H)-thiones by recyclization of 4-aryl-2,6-diamino-4H-thiopyranes

โœ Scribed by V. D. Dyachenko; S. G. Krivokolysko; Yu. A. Sharanin; V. P. Litvinov

Publisher
Springer US
Year
1997
Tongue
English
Weight
365 KB
Volume
33
Category
Article
ISSN
0009-3122

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Synthesis of 2,6-Diamino-3,5-dicyano-4-ethyl-4H-thiopyran and Its Recyclization into 6-Amino-3,5-dicyano-4-ethylpyridine-2(1H)-thione. -Three component condensation of propionaldehyde with malononitrile and cyanothioacetamide provides the title diaminothiopyran (IV) which recyclizes at reflux into