[Cl:1][C:2]1[C:3]([CH2:11][CH3:12])=[C:4]([NH2:10])[C:5]([CH2:8][CH3:9])=[CH:6][CH:7]=1.[N+:13]([O-])([OH:15])=[O:14]>OS(O)(=O)=O>[Cl:1][C:2]1[C:3]([CH2:11][CH3:12])=[C:4]([NH2:10])[C:5]([CH2:8][CH3:9])=[C:6]([N+:13]([O-:15])=[O:14])[CH:7]=11.83 ml (10.9 mmol) 3-Chloro-2,6-diethyl-phenylamine (1) is dissolved on an ice-bath at 0° C. in 8 ml conc. H2SO4. 562 μl (12.0 mmol; 1.1 eq.) 90% ige HNO3 is added and the reaction mixture is stirred for 2.5 hours at 0° C. The reaction mixture is pored on ca. 200 ml ice and the obtained solution is extracted 8 times with 50 to 100 ml EE each. The combined organic layers are dried over magnesium sulphate and the solvent is removed under reduced pressure yielding 2.1 g of crude product. After purification by flash chromatography 1.24 g (5.42 mmol; 50%) of 2 could be obtained.
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