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The detailed synthesis of the pyridine derivatives (14–17); Reagents and conditions: i) Amm. acetate, Acetic acid, reflux 12 h; ii) Amm. acetate, butanol, reflux 5 h; iii) POCl3, PCl5, heating 10 h; iv) NaN3, DMF, reflux 8 h; ii) NH2NH2, dioxane, reflux 12 h.
