[Br:1][C:2]1[CH:3]=[C:4]([O:9][CH2:10][CH2:11][CH2:12][O:13][CH3:14])[C:5](=[O:8])[NH:6][CH:7]=1.I[CH3:16]>C1C=CC=CC=1.C(=O)([O-])[O-].[Ag+2]>[Br:1][C:2]1[CH:3]=[C:4]([O:9][CH2:10][CH2:11][CH2:12][O:13][CH3:14])[C:5]([O:8][CH3:16])=[N:6][CH:7]=1A mixture of 113.26 mmol of 5-bromo-3-(3-methoxypropoxy)-1H-pyridin-2-one, 79.28 mmol of silver carbonate and 158.56 mmol of iodomethane in 230 ml of benzene is stirred at 45° C. with exclusion of light for 24 hours. The reaction mixture is cooled to room temperature, and the silver salts are filtered off. The filtrate is washed with 2% sodium bicarbonate solution and water (2×). The organic phase is dried over sodium sulphate and evaporated. The crude title compound is obtained as a beige oil from the residue and is employed without further purification in the next stage. Rf=0.45 (EtOAc-heptane 1:2); Rt=4.34 (Gradient I).
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