Abstract
3-amino-4,6-dimethyl-2-ethylseleno[2,3-b]pyridine carboxylate (5) was prepared by a reaction of dipyridyl diselenide derivative (3) with sodium borohydride as a reducing agent followed by α-haloester. The reaction of 5 with hydrazine hydrate afforded the corresponding carbohydrazide 8. The benzylidene derivative 9 provided novel heterocycles of pyrimidoseleno pyridine and thiazinoseleno pyridine derivatives (10–12), upon treatment with triethylorthoformate, acetic anhydride, and carbon disulfide, respectively.
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