Ethyl 4-(1H-imidazol-1-yl)benzoate → 4-(1-Imidazolyl)benzoic Acid

HRID 355741

Reaction equation

HRID 355741 reaction equation
[N:1]1([C:6]2[CH:16]=[CH:15][C:9]([C:10]([O:12]CC)=[O:11])=[CH:8][CH:7]=2)[CH:5]=[CH:4][N:3]=[CH:2]1>Cl>[N:1]1([C:6]2[CH:7]=[CH:8][C:9]([C:10]([OH:12])=[O:11])=[CH:15][CH:16]=2)[CH:5]=[CH:4][N:3]=[CH:2]1

Participants

3

Reactant 1

HCID 13423940Ethyl 4-(1H-imidazol-1-yl)benzoate

Product 1

HCID 7365294-(1-Imidazolyl)benzoic Acid

Reagents, catalysts & solvents 1

HCID 313Hydrochloric AcidSolvent

Procedure

Ethyl 4-(imidazol-1-yl)benzoate (0.5 g, 2.3 mmol) was heated at reflux in 5N HCl (40 ml) for 1 h, evaporated to dryness under reduced pressure and the resulting white solid dried in vacuo to afford 4-(imidazol-1-yl)benzoic acid This was suspended in dry toluene (40 ml) and thionyl chloride (2 ml) added under argon. The mixture was heated to reflux for 1.5 h and then evaporated to dryness under reduced pressure. The oil was dissolved in dichloromethane under argon and 4-methoxy-3-(4-methyl-1-piperazinyl)phenylamine (551 mg, 2.3 mmol) was added followed by triethylamine (2 ml). The mixture was stirred at room temperature under argon for 2 h and then partitioned between dichloromethane (50 ml) and saturated potassium carbonate (50 ml), and the organic extracts dried (sodium sulphate). The organic solution was filtered, evaporated to dryness under reduced pressure and purified by column chromatography (silica, chloroform/methanol 5-10%) to afford the amide (809 mg, 90%) which was crystallised from methanol diethyl ether as the oxalate salt.

Workup

  1. customevaporated to dryness under reduced pressure
  2. customthe resulting white solid dried in vacuo

Sources & evidence

ORD record
ord-22a0066a12e542ecaac8bb2bf39742d7
Source dataset
uspto-grants-1998_11
Patent number
US05834471

Linked notes

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