Phosgene → HCID 72636696, compound

To a solution of cis-4,5-bis-(4-chloro-phenyl)-2-(2-isopropoxy-4-methoxy-phenyl)-4,5-dihydro-imidazole (5 g, 10.98 mmol, example 2) in methylene chloride (50 mL) cooled to 0° C. were added triethylamine (3 mL, 21.96 mL) and phosgene (8.7 mL, 16.47 mmol, ˜20% solution in toluene), respectively. The reaction mixture was stirred at 0° C. for 30 min then the excess reagents and solvent were removed under reduced pressure. The residue was taken in methylene chloride (˜100 mL) and the solution was filtered through a plug of silica gel (˜50 g). The silica gel was washed with 20% ethyl acetate in hexanes. The filtrate was concentrated in vacuo and the residue was purified by flash chromatography (Biotage system, KP-Sil™ 32-63 μm, 60 Å silica gel, eluting with 5%, 10%, 20% ethyl acetate in hexanes) to give rac-4,5-bis-(4-chloro-phenyl)-2-(2-isopropoxy-4-methoxy-phenyl)-4,5-dihydro-imidazole-1-carbonyl chloride as white solids (4.31 g, 76%).

1. customthe excess reagents and solvent were removed under reduced pressure
2. filtrationthe solution was filtered through a plug of silica gel (˜50 g)
3. washThe silica gel was washed with 20% ethyl acetate in hexanes
4. concentrationThe filtrate was concentrated in vacuo
5. customthe residue was purified by flash chromatography (Biotage system, KP-Sil™ 32-63 μm, 60 Å silica gel, eluting with 5%, 10%, 20% ethyl acetate in hexanes)

ORD record

ord-c81bd684aa1c4a4db9e5b317fd235a60

Source dataset

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07893278B2