3-Nitrophenol → 138563-69-6

HRID 2181180Notes

Reaction equation

HRID 2181180 reaction equation
[N+:1]([C:4]1[CH:5]=[C:6]([OH:10])[CH:7]=[CH:8][CH:9]=1)([O-:3])=[O:2].Br[CH2:12][C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14].C(=O)([O-])[O-].[K+].[K+]>CC(C)=O>[N+:1]([C:4]1[CH:5]=[C:6]([CH:7]=[CH:8][CH:9]=1)[O:10][CH2:12][C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])([O-:3])=[O:2]

Participants

5

Reactant 3

HCID 111373-NitrophenolHCID 11430Potassium CarbonateHCID 79177tert-Butyl bromoacetate

Product 1

HCID 309909138563-69-6Yield 92%

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Procedure

A mixture of 3 g (21.56 mmol) of 3-nitrophenol, 4.3 g (22 mmol) of tert-butyl bromoacetate, 3.2 g of anhydrous potassium carbonate and 50 ml of acetone is stirred overnight at room temperature. The mixture is filtered and washed with acetone and both the filtrate and the washing product are evaporated to give a yellow oil. The oil is purified on a silica gel chromatography column using an EtOAc/cyclohexane mixture (50/50) as the eluent to give 5 g (92%) of tert-butyl 3-nitrophenoxyacetate (colourless oil). 2 g of Pd/C (10%) are added to a solution of 4.8 g (18.95 mmol) of tert-butyl 3-nitrophenoxyacetate in 20 ml of ethanol and the mixture is hydrogenated overnight at one atmosphere. The catalyst is filtered off. The solvent is evaporated off to give 3.38 g (80%) of tert-butyl 3-amidophenoxyacetate, which is chromatographed on a silica gel column using an EtOAc/cyclohexane mixture (50/50) as the eluent. A mixture of the resulting amine (0.5 g, 2.24 mmol) and 1,2-epoxy-3-phenoxypropane is heated at 70° C. overnight. After cooling, the product is washed with ethanol and the precipitate is filtered off to give 0.6 g of the tert-butyl ester. 0.6 g of this ester and 15 ml of 6 N HCl are mixed overnight at 80° C. The solvent is evaporated off and the residue is washed with an EtOH/CH3CN mixture and then recrystallized from CH3CN to give 0.36 g of a salt with the following characteristics: melting point 138-139° C.; 1H NMR (DMSO-d6) δ 3.82 (m, 2H), 3.96 (m, 4H), 4.06 (m, 1H), 4.72 (s, 2H), 6.88-7.00 (n, 5H Ar), 7.24-7.45 (m, 4H Ar).

Workup

  1. filtrationThe mixture is filtered
  2. washwashed with acetone and both the filtrate
  3. customthe washing product are evaporated
  4. customto give a yellow oil
  5. customThe oil is purified on a silica gel chromatography column

Sources & evidence

ORD record
ord-62af25a365e544f7b5b7745c455c29e5
Source dataset
uspto-grants-2005_05
Patent number
US06890955B2

Reaction notes

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