C(=O)([O-])[O-].[K+].[K+].[Br:7][C:8]1[C:9](Cl)=[N:10][CH:11]=[C:12]([N+:15]([O-:17])=[O:16])[C:13]=1[CH3:14].O.[Cl:20][C:21]1[CH:26]=[CH:25][C:24]([OH:27])=[CH:23][C:22]=1[C:28]([F:31])([F:30])[F:29]>CC(CC)=O>[Br:7][C:8]1[C:9]([O:27][C:24]2[CH:25]=[CH:26][C:21]([Cl:20])=[C:22]([C:28]([F:31])([F:29])[F:30])[CH:23]=2)=[N:10][CH:11]=[C:12]([N+:15]([O-:17])=[O:16])[C:13]=1[CH3:14]
In a 250 ml three-necked round-bottomed flask, 4.00 g 4-chloro-3-trifluoromethyl-phenol is dissolved in 80 ml of dry methyl-ethyl-ketone. 3.85 g potassium carbonate followed by 4.70 g of 3-bromo-2-chloro-4-methyl-5-nitro-pyridine are added. The resulting brown suspension is heated to 80° C. under stirring for 3 hours. Afterwards, the green suspension is allowed to reach an ambient temperature and it then poured into water. The mixture is extracted with ethyl actetate (3×50 ml). The combined organic phases are washed with brine, dried over sodium sulfate, filtered and the solvent removed in vacuo. After purification of the raw product on silica gel with cyclohexane/ethyl actetae 19:1 (v:v) 7.36 g of the title compound are obtained as a light yellow gum that solidifies upon standing (MP: 73-74° C.).
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