[C:1]([C:4]1[C:5](=[O:11])[NH:6][C:7](=[S:10])[NH:8][CH:9]=1)(=[O:3])[CH3:2].[OH-].[Na+].[CH3:14]I.Cl>>[C:1]([C:4]1[C:5](=[O:11])[NH:6][C:7]([S:10][CH3:14])=[N:8][CH:9]=1)(=[O:3])[CH3:2]5-Acetyl-2-thioxo-2,3-dihydropyrimidin-4(1H)-one (Ryan Scientific) (2.3 g, 13.51 mmol) was dissolved in NaOH (20.27 mL, 20.27 mmol), then MeI (0.894 mL, 14.30 mmol) was added to the reaction mixture while stifling. The reaction mixture was heated at 40° C. for 1.5 hours. Additional MeI (0.894 mL, 14.30 mmol) was added and the reaction was allowed to stir at rt for 18 hours. The reaction mixture was cooled with an ice-water bath, acidified to pH 6 with concentrated HCl solution, then the resulting precipitate was filtered to obtain 1.72 g of the desired product (69% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 2.49 (br. s., 6 H) 8.35 (s, 1 H) 13.40 (br. s., 1 H). MS (ES+): m/z=185.1 (100) [MH+]. HPLC: tR=1.0 minute over 3 minutes. Purity: >90% [HPLC (LC/MS) at 220 nm].
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