[Cl-:1].[P+]=O.N1C2C(=CC=CC=2)C=CC=1.[Br:14][C:15]1[C:16](=O)[NH:17][CH:18]=[C:19]([N+:22]([O-:24])=[O:23])[C:20]=1[CH3:21]>O>[Br:14][C:15]1[C:16]([Cl:1])=[N:17][CH:18]=[C:19]([N+:22]([O-:24])=[O:23])[C:20]=1[CH3:21]In a 25 ml single-necked round-bottomed flask, to 1.72 ml phosphorous oxide chloride kept at a temperature of 5° C., 0.857 ml quinoline and 3.40 g of 3-bromo-4-methyl-5-nitro-1H-pyridin-2-one are added consecutively. The resulting beige suspension is stirred under heating to 120° C. whereupon a brown solution is obtained. Stirring is continued for 2 hours. Afterwards, the solution is cooled down to an ambient temperature and poured into water. The resulting precipitate is collected by filtration, the filter cake washed with water (4×) and dried to give 3.15 g of the title compound in the form of a brown solid (MP: 60-62° C.).
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