Phosgene → rac-(4S*,5R*)-2-(6-tert-butyl-4-ethoxy-pyridin-3-yl)-4,5-bis-(4-chloro-phenyl)-4,5-dimethyl-4,5-dihydro-imidazole-1-carbonyl chloride

Participants

Reaction Steps

To a solution of rac-5-[(4S*,5R*)-4,5-bis-(4-chloro-phenyl)-4,5-dimethyl-4,5-dihydro-1H-imidazol-2-yl]-2-tert-butyl-4-ethoxy-pyridine (20 mg) and triethylamine (200 uL, 1.43 mmol) in 5 mL of methylene chloride at 0° C. was added 0.3 mL of 1.9 M phosgene in toluene solution (Fluka). After stirring for 30 min the mixture was taken up in methylene chloride and washed with water, dried over anhydrous sodium sulfate, filtered and concentrated to give rac-(4S*,5R*)-2-(6-tert-butyl-4-ethoxy-pyridin-3-yl)-4,5-bis-(4-chloro-phenyl)-4,5-dimethyl-4,5-dihydro-imidazole-1-carbonyl chloride as a white solid (22 mg). It was used in the next reaction without purification

Provenance & Evidence