[NH2:1][C:2]1[C:7]([N+:8]([O-])=O)=[C:6]([CH3:11])[C:5]([N+:12]([O-])=O)=[C:4]([CH3:15])[N:3]=1.C(O)C.[H][H].Cl>[Pd].C.C(O)(C)C>[NH2:1][C:2]1[C:7]([NH2:8])=[C:6]([CH3:11])[C:5]([NH2:12])=[C:4]([CH3:15])[N:3]=1
A 500 ml Parr Bottle was charged with 2-amino-4,6-dimethyl-3,5-dinitropyridine (21.2 g, 0.10 mole), 250 ml absolute ethanol, and 20 g 5% Pd/charcoal catalyst. The mixture was subjected to hydrogenation at ambient temperature with an initial hydrogen pressure of 60 psig. When no further uptake of hydrogen was observed, the mixture was filtered free of catalyst under a nitrogen atmosphere, and concentrated under vacuum to a volume of about 100 ml. The product concentrate was treated, under nitrogen at ice temperature, with a cold solution of hydrogen chloride (0.5 mole) in 85 ml anhydrous isopropyl alcohol. The trihydrochloride salt of 2,3,5-triamino-4,6-dimethylpyridine was obtained after vigorous stirring, filtering under nitrogen, and vacuum drying under high vacuum over P2O5 at 80°-90° C.
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