Phosgene → HCID 76617664, compound

Participants

Reaction Steps

4,5-Bis-(4-chloro-phenyl)-2-(4-cyano-2-ethoxy-phenyl)-4,5-dihydro-imidazole (1.25 g, 2.88 mmol, example 25) was dissolved in methylene chloride and diisopropylethylamine (2.41 mL, 13.8 mmol) was added. The mixture was cooled in an ice bath and phosgene (6.09 mL, 11.52 mmol, 20% in toluene) was added. The reaction mixture was stirred for 30 mm at ice temperature and concentrated. Purification of the crude residue by flash column chromatography (silica gel, eluting with a gradient of ethyl acetate in hexanes) gave 4,5-bis-(4-chloro-phenyl)-2-(4-cyano-2-ethoxy-phenyl)-4,5-dihydro-imidazole-1-carbonyl chloride (1.35 g, 94%).

Provenance & Evidence