N[C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[CH:6][C:5]([N+:11]([O-:13])=[O:12])=[C:4]([NH2:14])[N:3]=1.[CH3:15]S(C)=O.[CH3:19][NH2:20]>CN(C)C(=O)C.CO>[CH3:19][NH:20][C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[CH:6][C:5]([N+:11]([O-:13])=[O:12])=[C:4]([NH:14][CH3:15])[N:3]=1To a solution of 2,6-diamino-3,5-dinitropyridine (25.0 g, 0.125 mole) and 225 ml dimethylsulfoxide in a 500 ml Parr bottle was added a solution of methylamine (20 g, 0.65 mole) in 75 ml N,N-dimethylacetamide (DMAc). The reaction was shaken for 4 hours at ambient temperatures and then heated 20 hours at 70°C. Upon cooling, the heterogeneous mixture was diluted with 100 ml methanol, filtered, washed with 200 ml DMAc-methanol (lv/lv), twice with methanol and dried. 2,6-Di(methylamino)-3,5-dinitropyridine, m.p. 323°-325°C (dec.) was obtained as a golden yellow solid (25.0 g, 93% yield). This product, unlike 2,6-diamino-3,5-dinitropyridine, is essentially insoluble in dimethylsulfoxide and 85% H3PO4. Anal. Calcd. for C7H9N5O4 : C, 37.0; H, 4.0; N, 30.8. Found: C, 37.2; H, 3.8; N, 31.0.
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