application of novel nanostructured dinitropyrazine molten salt catalyst for the synthesis of sulfanylpyridines via anomeric based oxidation

1,4-dinitropyrazine-1,4-diium trinitromethanide {[1,4-pyrazine-no2][c(no2)3]2} as a novel nanostructured molten salt (nms) catalyzed the synthesis of 2-amino-3,5-dicarbonitrile-6-sulfanylpyridine derivatives via the one-pot three-component condensation reaction between several aromatic aldehyde, malononitrile and benzyl mercaptan at room temperature under solvent-free conditions. the synthesized nms catalyst was fully characterized by ftir, 1h nmr, 13cnmr, mass, thermal gravimetric, x-ray diffraction patterns, scanning electron microscopy and transmission electron microscopy analysis. the major advantages of described methodology are mildness, ease of separation, good yields and short reaction times. a rational mechanism was suggested for the final step of the 2-amino-3,5-dicarbonitrile-6-sulfanylpyridines synthesis. we think that the proposed mechanism has potential for entering into the graduate text book in the future.