[H-].[Na+].CO[C:5](=[O:16])[CH2:6][CH2:7][C:8]1[CH:9]=[N:10][C:11]([O:14][CH3:15])=[CH:12][CH:13]=1.[CH:17](OC)=O.[NH2:21][C:22]([NH2:24])=[S:23]>COCCOC>[CH3:15][O:14][C:11]1[N:10]=[CH:9][C:8]([CH2:7][C:6]2[C:5](=[O:16])[NH:21][C:22](=[S:23])[NH:24][CH:17]=2)=[CH:13][CH:12]=1
To a suspension of NaH, 60% dispersion on mineral oil (1.3 eq, 110 mg, 60%) in 700 μl of dry 1,2-dimethoxyethane under argon atmosphere was added a solution of 3-(6-Methoxy-pyridin-3-yl)-propionic acid methyl ester (590 mg, 3.02 mmol, 1 eq) and methyl formate (2 eq, 380 μl) in 4 ml of dry 1,2-dimethoxyethane. The sealed mixture was stirred at room temperature for 16 hours (overnight). Solvent from the mixture was then evaporated. In the rest was added 15 ml of diethyl ether and using ultrasound bath the precipitate was formed. The liquor was removed and in the rest was triturated once more with diethyl ether. The precipitate was dried and was dissolved in 5 ml of absolute ethanol, thiourea (1.5 eq, 345 mg) was added and the resulting mixture was heated at 90° C. (temperature on display of heating device) for 2 hours. The solvent was evaporated and the rest was dissolved in 5 ml of water. pH of the solution was adjusted to 6-7 and the formed precipitate was collected by filtration and was dried to afford 5-(6-methoxy-pyridin-3-ylmethyl)-2-thioxo-2,3-dihydro-1H-pyrimidin-4-one (395 mg, yield=49.8%, purity=95%). MS: [M+H]+=250.18 1H NMR (300 MHz; DMSO-d6) δ/ppm 3.45 (s, 2H), 3.80 (s, 3H), 6.70 (d, J=8.36 Hz, 1H), 7.42 (s, 1H), 7.55 (dd, J=8.36 Hz, J=2.40 Hz, 1H), 8.05 (d, J=2.40 Hz, 1H), 12.10-12.60 (m, 2H)
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