Abstract
The amalgam (Na.Hg) reduction of some 4-substituted-2-amino-3,5-dicyano-6-methoxypyridines 3 results in the formation, in high yields of 3,4-dihydropyridines 2. Highfield 1H and 13C nmr studies provide unambiguous support for the structures proposed. The synthesis of C-4 deuterium labeled dihydropyridine 2c-D, by this procedure, let us understand the role played by this dihydropyridines as intermediates in the necessary oxidation path into the synthesis of pyridines 3 from malononitrile and benzylidenemalononitriles 1 in methanol/sodium methoxide.
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