Cesium carbonate → 4-chloro-6-(3,5-dimethyl-1H-1,2,4-triazol-1-yl)-2-(methylthio)pyrimidine

참여 물질

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To a slurry of 4,6-dichloro-2-(methylthio)pyrimidine (1-1) (1.00 g, 5.13 mmol, 1.0 eq.) and cesium carbonate (2.70 g, 7.67 mmol, 1.5 eq.) in DMF (40 mL) at 0° C. under nitrogen was added a solution of 3,5-dimethyl-1H-1,2,4-triazole (498 mg, 5.13 mmol, 1.0 eq.) in DMF (20 mL) via a dropping funnel over 1 hour. The reaction was then warmed to room temperature. The reaction was monitored by TLC and was complete after 1 hour. The reaction was quenched by addition of water (100 mL) and extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated to dryness. The resulting residue was purified by silica gel column chromatography (0-50% ethyl acetate in hexanes) to afford 4-chloro-6-(3,5-dimethyl-1H-1,2,4-triazol-1-yl)-2-(methylthio)pyrimidine (1-2) as a white solid. 1H NMR (300 MHz, CDCl3) δ 7.58 (s, 1H), 2.90 (s, 3H), 2.60 (s, 3H), 2.41 (s, 3H). LRMS m/z (M+H) 256 found, 256 required.

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