Diethylamine → 3-[3-(2-Bromobenzyl)-3H-imidazol-4-yl]-3-methylbutan-1-ol

Temperature

80 °C

To a solution of 4-[3-(tert-butyldimethylsilanyloxy)-1,1-dimethylpropyl]-1-trityl-1H-imidazole (650 mg, 1.27 mmol) in CH3CN (10 mL) at ambient temperature is added a solution of 2-bromobenzyl bromide (420 mg, 1.68 mmol) in CH3CN (10 mL). The resulting solution is stirred at 80° C. for 6 h. The mixture is cooled to ambient temperature and diethylamine (2 mL) is added, followed by MeOH (10 mL) and the mixture is heated at 75° C. for 1 hr and stirred at ambient temperature overnight. To the reaction mixture is added HCl/dioxane (4 M, 5 mL, 20 mmol) and stirred at ambient temperature for 1 h. The mixture is neutralized with saturated aqueous NaHCO3 and concentrated. The residue is partitioned between CH2Cl2 and brine. The organic layer is washed with brine, dried over Na2SO4 and concentrated to give an oil, which is subjected to flash chromatography (silica gel) eluting with MeOH:CH2Cl2 to yield the desired compound. MS (ESI) m/z 323 (M+H).

1. temperatureThe mixture is cooled to ambient temperature
2. temperaturethe mixture is heated at 75° C. for 1 hr
3. stirringstirred at ambient temperature overnight
4. stirringstirred at ambient temperature for 1 h
5. concentrationconcentrated
6. customThe residue is partitioned between CH2Cl2 and brine
7. washThe organic layer is washed with brine
8. dry with materialdried over Na2SO4
9. concentrationconcentrated
10. customto give an oil, which
11. washeluting with MeOH

ORD record

ord-562c9b54bf2843f58f5b7b908d5f5023

Source dataset

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08835646B2