Water → 4-Chloro-6-(4-methyl-1H-imidazol-1-yl)pyrimidine

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Reaction Steps

A mixture of 4,6-dichloropyrimidine (11.92 g, 80 mmol), 4-methyl-1H-imidazole (6.57 g, 80 mmol), and cesium carbonate (26.1 g, 80 mmol) was stirred in DMF (50 mL) at room temperature for 18 h. The reaction was diluted into 200 mL water and extracted three times with 200 mL EtOAc. The combined organic layers were concentrated and purified by flash chromatography on a 300 g silica gel cartridge with 25 to 75% ethyl acetate in hexane to yield a mixture of the two regioisomeric products. The pooled fractions were concentrated to about 200 mL volume and cooled to yield 4-chloro-6-(4-methyl-1H-imidazol-1-yl)pyrimidine (5.70 g, 37% yield). The positive identification of the 4-methylimidazole regioisomer was accomplished by its NMR NOE properties. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 8.80 (1H, d, J=0.50 Hz), 8.36 (1H, d, J=1.26 Hz), 7.29-7.31 (1H, m), 7.25 (1H, d, J=1.01 Hz), 2.27 (3H, d, J=1.01 Hz). LCMS: RT=0.50 min, MH+=195.1.

Provenance & Evidence