Br.Br[CH2:3][C:4]1[N:8]([CH3:9])[C:7]2[CH:10]=[CH:11][CH:12]=[CH:13][C:6]=2[N:5]=1.[CH3:14][C:15]1[N:20]=[C:19]([SH:21])[N:18]=[C:17]([OH:22])[CH:16]=1.C(N(CC)CC)C>C(O)C>[CH3:14][C:15]1[N:20]=[C:19]([S:21][CH2:3][C:4]2[N:8]([CH3:9])[C:7]3[CH:10]=[CH:11][CH:12]=[CH:13][C:6]=3[N:5]=2)[N:18]=[C:17]([OH:22])[CH:16]=1A mixture of 2-(bromomethyl)-1-methyl-benzimidazole hydrobromide (6.8 mmol), 6-methyl-2-sulfanylpyrimidin-4-ol (740 mg, 5.2 mmol), and triethylamine (4 mL, 28.7 mmol) in absolute ethanol (30 mL) was stirred at room temperature overnight. The mixture was recovered, evaporated, and then co-evaporated with EtOAc (20 mL). The solid residue was treated with water (200 mL). The solid product was recovered by filtration, washed with water (2×20 mL), diethyl ether (2×20 mL), and hexanes (2×20 mL), and then dried in vacuo, affording 6-methyl-2-{[(1-methyl-1H-benzimidazol-2-yl)methyl]sulfanyl}pyrimidin-4-ol (1.3 g, 90% yield); 1H NMR (400 MHz, DMSO-d6): δ 2.18 (s, 3H), 3.83 (s, 3H), 4.70 (s, 2H), 6.02 (s, 1H), 7.19 (m, 2H), 7.53 (m, 2H); M+ 287. The product was used without further purification.
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