Abstract
4,6-Dimethyl-2H-thieno[2,3-b]pyridin-3-one reacts with 2-aryl-1,1-dicyanoethylenes or an aromatic aldehyde/ketone (cyclohexanone and piperidone derivatives) and malononitrile to give substituted 2-amino-3-cyano-7,9-dimethyl-4H-pyrano[2",3":4,5]thieno[2,3-b]pyridines.
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Shestopalov, A.M., Naumov, O.A. Synthesis of substituted 2-amino-3-cyano-7,9-dimethyl-4H-pyrano[2",3":4,5]thieno[2,3-b]pyridines. Russian Chemical Bulletin 52, 1380–1385 (2003). https://doi.org/10.1023/A:1024835412937
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DOI: https://doi.org/10.1023/A:1024835412937