تفاعل #59799

معادلة التفاعل

[4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-[4-hydroxy methyl-piperidin-1-yl]-methanone

carbon tetrabromide

triphenyl phosphine

→

[4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-[4-bromomethyl-piperidin-1-yl]-methanone

المردود 76.2%

المذيبات

methylene chloride

water

ظروف التفاعل

المعالجة

1. 1
   استخلاصextracted with methylene chloride
2. 2
   غسيلThe organic extracts were washed with water, brine
3. 3
   تجفيفdried over anhydrous sodium sulfate
4. 4
   أخرىEvaporation of the solvents and chromatography of the residue over silica gel using 1-5% methanol in methylene chloride

الإجراء التجريبي

To a cooled (0° C.) solution of [4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-[4-hydroxy methyl-piperidin-1-yl]-methanone (60 mg, 0.096 mmol) in methylene chloride (2 mL) was added carbon tetrabromide (70 mg, 0.210 mmol) followed by triphenyl phosphine (55 mg, 0.21 mmol). The reaction mixture was stirred at ambient temperature for 2.5 h. The reaction was diluted with water and extracted with methylene chloride. The organic extracts were washed with water, brine, and dried over anhydrous sodium sulfate. Evaporation of the solvents and chromatography of the residue over silica gel using 1-5% methanol in methylene chloride gave [4,5-bis-(4-chloro-phenyl)-2-(2-ethoxy-4-trifluoromethyl-phenyl)-4,5-dihydro-imidazol-1-yl]-[4-bromomethyl-piperidin-1-yl]-methanone (50 mg, 76%).

المصدر