Water → 2-[5-(4-chloro-phenyl)-1-(2,4-dichloro-phenyl)-4-ethyl-1H-pyrazol-3-yl]-3-methyl-3,5-dihydro-imidazol-4-one

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Reaction Conditions

Reaction Steps

To a solution of 26 (100 mg, 0.23 mmol) in acetonitrile (8 mL) at room temperature was sequentially added potassium carbonate (150 mg, 1.09 mole) and methyl iodide (2 g, 14.08 mmol) slowly. The mixture was stirred at 60° C. for 6 h. Water was added and the resulting mixture was extracted with ethyl acetate (2×50 mL). The combined extracts were washed with brine, dried over anhydrous sodium sulfate, filtered, and concentrated. Purification of the crude residue by flash chromatography on silica gel eluting with hexanes/ethyl acetate (1:1) gave the compound 29 (70 mg, 68%) as a white solid. 1H NMR (400 MHz, CDCl3) δ 7.45 (d, 1H), 7.30 (d, 2H), 7.25 (dd, 1H), 7.18 (d, 1H), 7.09 (d, 2H), 4.88 (s, 0.82H), 4.51 (s, 1.18H), 3.42 (s, 1.77H), 3.24 (s, 1.23H), 2.65 (q, 2H), 1.15 (t, 3H); ESMS m/: 447.0 (M+1).

Provenance & Evidence