反应详情

To a solution of 4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-1H-imidazole (46 g, 95.97 mmol, example 1) and triethylamine (66.9 mL, 479.9 mmol) in methylene chloride (2 L) cooled to 0° C. was added phosgene (124.3 mL, 239.9 mmol, ˜20% solution in toluene) dropwise over a period of 30 min. The reaction mixture was stirred at room temperature for 1 h. Nitrogen gas was bubbled through the reaction mixture to remove excess phosgene. The reaction mixture was concentrated to dryness, and the residue was dried in vacuo for 1 h to give 4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazole-1-carbonyl chloride (51 g, 98% yield) as off-white solids. The product was used without further purification.

1. customNitrogen gas was bubbled through the reaction mixture
2. customto remove excess phosgene
3. concentrationThe reaction mixture was concentrated to dryness
4. customthe residue was dried in vacuo for 1 h