[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[C:11]([N+:13]([O-:15])=[O:14])[CH:12]=1)[N:9]=[CH:8][CH:7]=[CH:6]2.[CH3:16][C:17](C)([CH3:21])[C:18](O)=O.OS(O)(=O)=O.S(OOS([O-])(=O)=O)([O-])(=O)=O.[NH4+].[NH4+].C(=O)=O.[NH4+].[OH-]>CC#N.O.[N+]([O-])([O-])=O.[Ag+]>[C:17]([C:8]1[CH:7]=[CH:6][C:5]2[C:10](=[C:11]([N+:13]([O-:15])=[O:14])[CH:12]=[C:3]([O:2][CH3:1])[CH:4]=2)[N:9]=1)([CH3:21])([CH3:18])[CH3:16]6-Methoxy-8-nitroquinoline (1 mmol) (scheme 1) was dissolved in CH3CN (5 mL) while reaction mixture was warmed to 70° C. Silver nitrate (0.6 mmol), trimethylacetic acid (2.5 mmol), and 10% H2SO4 (10 mL) was then added to the reaction mixture. A freshly prepared solution of ammonium persulfate (3 mmol) in water (10 mL) was added drop wise to the pre-heated (70° C.) mixture during 10 minutes. The heating source was then removed and reaction proceeded with evolution of carbon dioxide. After 10 minutes, reaction mixture was poured onto ice, and resulting mixture was made alkaline with addition of 30% NH4OH. Extracted with ethyl acetate (4×50 mL), and combined extracts were washed with NaCl solution (2×10 mL). Dried over Na2SO4 and solvent removed in vacuo to afford oil, which on flash column chromatography over silica gel (230-400 mesh) gave 2-tert-Butyl-6-methoxy-8-nitroquinoline in good yield.
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