[CH3:1][C:2]1[C:7]([CH3:8])=[C:6]([N+]([O-])=O)[C:5]([CH3:12])=[CH:4][N+:3]=1[O-:13].[ClH:14].C(=O)([O-])[O-].[K+].[K+]>C(OC(C)C)(C)C.CCCCCC.O.CN(C)C=O>[Cl:14][C:6]1[C:5]([CH3:12])=[CH:4][N+:3]([O-:13])=[C:2]([CH3:1])[C:7]=1[CH3:8]To 2,3,5-trimethyl-4-nitropyridine1-oxide (850 g, 4.67 mol), water (400 g) and 36% concentrated hydrochloric acid (1.69 kg) was added and the mixture was heated to 70° C. To the mixture, N,N-dimethylformamide (115 mL) was added and then the resultant mixture was heated to 100° C. After completion of the reaction, the reaction mixture was cooled to 20° C. and poured into a mixture of potassium carbonate (1.40 kg) and water (7 L). The mixture was extracted with chloroform (1.0 L×3), the organic layer dried over sodium sulfate and concentrated. The obtained crude product was stirred for 2 hours in a mixture of diisopropyl ether (500 mL) and n-hexane (1.0 L), and thereafter, sucking filtration was performed. The obtained wet product was dried under vacuum overnight to obtain a desired product (666.4 g).
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