Water → 1-(2-(P-NO2Phenoxy)ethyl)imidazole

HRID 1091647Notes

Reaction equation

HRID 1091647 reaction equation
[OH:1][CH2:2][CH2:3][N:4]1[CH:8]=[CH:7][N:6]=[CH:5]1.[H-].[Na+].F[C:12]1[CH:17]=[CH:16][C:15]([N+:18]([O-:20])=[O:19])=[CH:14][CH:13]=1.O>C1COCC1>[N+:18]([C:15]1[CH:16]=[CH:17][C:12]([O:1][CH2:2][CH2:3][N:4]2[CH:8]=[CH:7][N:6]=[CH:5]2)=[CH:13][CH:14]=1)([O-:20])=[O:19]

Participants

6

Reactant 4

HCID 962WaterHCID 9590p-FluoronitrobenzeneHCID 24758Sodium hydrideHCID 74168N-(2-Hydroxyethyl)imidazole

Product 1

HCID 135691861-(2-(P-NO2Phenoxy)ethyl)imidazoleYield 49.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

1-(Hydroxyethyl)imidazole (5.30 g; 47.3 mmol) was dissolved in anhydrous THF (50 mL) and cooled in an ice-bath. Sodium hydride (2.08 g of a 60 wt % dispersion in oil, 52.0 mmol) was added in portions over 10 min. The ice-bath was removed, and the mixture was stirred at room temperature for 20 min. A solution of 1-fluoro-4-nitrobenzene (5.0 mL, 47.2 mmol) in anhydrous THF (10 mL) was added over 5 min and the mixture stirred for a further 1.5 hr. Water (a few mL) was cautiously added and the mixture concentrated under reduced pressure. The residue was partitioned between EA (75 mL) and water (75 mL), and the phases separated. The aqueous phase was extracted twice with EA and the combined organic layers extracted three times with 1N hydrochloric acid. The pH of these acidic extracts was then adjusted to 7 with 5N aqueous sodium hydroxide and the resulting milky solution extracted three times with EA. The combined organic extracts were washed with water and brine, then dried over magnesium sulfate and concentrated under reduced pressure to give 1-(2-(4-nitrophenoxy)-ethyl)-1H-imidazole (5.46 g) as a brown oil. A solution of 1-(2-(4-nitrophenoxy)ethyl)-1H-imidazole (5.46 g; 2.34 mmol) in ethanol (60 mL) was hydrogenated at atmospheric pressure with 10% palladium on carbon (0.40 g) at room temperature for 20 hr. The mixture was filtered through diatomaceous earth and then concentrated under reduced pressure to give 4-[2-(1H-imidazol-1-yl)ethoxy]benzenamine (4.56 g) as a white solid.

Workup

  1. temperaturecooled in an ice-bath
  2. customThe ice-bath was removed
  3. stirringthe mixture stirred for a further 1.5 hr
  4. concentrationthe mixture concentrated under reduced pressure
  5. customThe residue was partitioned between EA (75 mL) and water (75 mL)
  6. customthe phases separated
  7. extractionThe aqueous phase was extracted twice with EA
  8. extractionthe combined organic layers extracted three times with 1N hydrochloric acid
  9. extractionthe resulting milky solution extracted three times with EA
  10. washThe combined organic extracts were washed with water and brine
  11. dry with materialdried over magnesium sulfate
  12. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-4aaf897aa12844449df7f82a3c8de9e7
Source dataset
uspto-grants-2012_03
Patent number
US08129396B2

Reaction notes

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