[Br:1][C:2]1[CH:3]=[C:4]([CH2:10][CH3:11])[C:5](=[O:9])[NH:6][C:7]=1[CH3:8].[CH3:12]I>C(Cl)(Cl)Cl.C(=O)([O-])[O-].[Ag+2]>[Br:1][C:2]1[C:7]([CH3:8])=[N:6][C:5]([O:9][CH3:12])=[C:4]([CH2:10][CH3:11])[CH:3]=15-Bromo-3-ethyl-6-methyl-1H-pyridin-2-one (25 g, 115.7 mmol) was dissolved in 200 ml of chloroform to form an orange solution. Silver carbonate (31.9 g, 115.7 mmol) was added and the mixture was vigorously stirred. Methyl iodide (10.8 ml, 1.5 mmol) was added to this suspension, which was then stirred in the dark at RT under nitrogen. After 3 days, the mixture was filtered and the solution was concentrated in a rotary evaporator. The residue was chromatographed on silica gel with n-heptane as mobile phase and afforded a colorless oil (21.7 g, 82%).
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