Benzyl Bromide → Methyl 5-acetyl-2,4-bis-benzyloxybenzoate

HRID 644592Notes

Reaction equation

HRID 644592 reaction equation
[C:1]([C:4]1[C:5]([OH:15])=[CH:6][C:7]([OH:14])=[C:8]([CH:13]=1)[C:9]([O:11][CH3:12])=[O:10])(=[O:3])[CH3:2].C(=O)([O-])[O-].[K+].[K+].[CH2:22](Br)[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1>C(#N)C>[C:1]([C:4]1[C:5]([O:15][CH2:1][C:4]2[CH:5]=[CH:6][CH:7]=[CH:8][CH:13]=2)=[CH:6][C:7]([O:14][CH2:22][C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)=[C:8]([CH:13]=1)[C:9]([O:11][CH3:12])=[O:10])(=[O:3])[CH3:2]

Participants

5

Reactant 3

HCID 7498Benzyl BromideHCID 11430Potassium CarbonateHCID 12482079Methyl 5-acetyl-2,4-dihydroxybenzoate

Product 1

HCID 11955869Methyl 5-acetyl-2,4-bis-benzyloxybenzoateYield 142.8%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

Methyl 5-acetyl-2,4-dihydroxybenzoate (2.62 g, 12.48 mmol) was dissolved in acetonitrile (40 ml), anhydrous potassium carbonate (4.93 g, 35.7 mmol) was added and the stirred mixture was treated with benzyl bromide (5.09 g, 29.75 mmol) and held at reflux for 3 hours. Upon cooling the solvent was removed in vacuo and the mixture partitioned between water and dichloromethane. The organic layer was separated and the solvent removed in vacuo to afford methyl 5-acetyl-2,4-bis-benzyloxybenzoate (3.48 g, 71%) as a colourless solid which was dried at 50° C. in a vacuum oven and used without further purification. 1H NMR (DMSO-d6) 8.21 (1H, s), 7.55 (4H, m), 7.43 (4H, m), 7.37 (2H, m), 7.04 (1H, s), 5.38 (4H, s), 3.79 (3H, s), 2.48 (3H, s). MS: [M+H]+ 391.

Workup

  1. temperatureat reflux for 3 hours
  2. temperatureUpon cooling the solvent
  3. customwas removed in vacuo
  4. customthe mixture partitioned between water and dichloromethane
  5. customThe organic layer was separated
  6. customthe solvent removed in vacuo

Sources & evidence

ORD record
ord-e5336c725f4147f98191697cb48db652
Source dataset
uspto-grants-2010_04
Patent number
US07700625B2

Reaction notes

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