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Bis(6-amino-1,2-dihydropyridine-3,5-dicarbonitriles) containing thioether linkages are prepared via the condensation of bis(cyanoacetamides) with α-substituted cinnamonitriles in the presence of piperidine. The target compounds can also be obtained via a three-component reaction of bis(cyanoacetamides) with two equivalents of both aldehydes and malononitrile in ethanol containing piperidine as a base.

Bis(2-cyanoacetamides): versatile precursors for bis(dihydropyridine-3,5-dicarbonitriles)