Chloroacetyl chloride → 1-{4-[4,5-Bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazole-1-carbonyl]-piperazin-1-yl}-2-chloro-ethanone

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Reaction Steps

[4,5-Bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-piperazin-1-yl-methanone (372 mg, 0.63 mmol, example 8A) and diisopropylethylamine (230 uL, 1.32 mmol) were dissolved in methylene chloride (4 mL) and cooled to ice temperature. Chloroacetyl chloride (100 uL, 1.26 mmol) in methylene chloride (1 mL) was added dropwise and this mixture was stirred for 30 min at ice temperature. The reaction was diluted with methylene chloride and washed with water. The organic layers were dried over anhydrous magnesium sulfate. The solids were filtered off, and the filtrate was concentrated. Purification of the crude material by flash chromatography using ethyl acetate and hexanes gave 1-{4-[4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazole-1-carbonyl]-piperazin-1-yl}-2-chloro-ethanone (193 mg, 0.29 mmol).

Provenance & Evidence