Triethylamine → 5-[2-[2-(Hydroxy)benzoylamino]ethylthio]imidazo[1,2-a]pyridine

HRID 5455

Reaction equation

HRID 5455 reaction equation
[NH2:1][CH2:2][CH2:3][S:4][C:5]1[N:10]2[CH:11]=[CH:12][N:13]=[C:9]2[CH:8]=[CH:7][CH:6]=1.C(N(CC)CC)C.C([C:24]1([OH:33])[CH:32]=[CH:31][CH:30]=[CH:29][CH:25]1[C:26](Cl)=[O:27])(=O)C>C(Cl)Cl>[OH:33][C:24]1[CH:32]=[CH:31][CH:30]=[CH:29][C:25]=1[C:26]([NH:1][CH2:2][CH2:3][S:4][C:5]1[N:10]2[CH:11]=[CH:12][N:13]=[C:9]2[CH:8]=[CH:7][CH:6]=1)=[O:27]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 152293695-[2-(Amino)ethylthio]imidazo[1,2-a]pyridineHCID 573615642-Acetylsalicyloyl chloride

Product 1

HCID 233629775-[2-[2-(Hydroxy)benzoylamino]ethylthio]imidazo[1,2-a]pyridineYield 56%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 5-[2-(amino)ethylthio]imidazo[1,2-a]pyridine (3.87 g, 20 mmoles) and triethylamine (5.58 ml, 40 mmoles) in methylene chloride (200 ml) was added o-acetylsalicyloyl chloride (4.77 g, 24 mmoles) under ice-cooling with stirring and the mixture was stirred at room temperature for 30 minutes. After the solvent was distilled off, ethanol (60 ml) and 1N NaOH (40 ml) were added to the residue, followed by stirring for 1 hour. 1N HCl (40 ml) was added and ethanol was distilled off, and then the residue was extracted with chloroform and dried over anhydrous magnesium sulfate. After the solvent was distilled off, the residue was purified by column chromatography (eluent: ethyl acetate/ethanol=10:1) to obtain 3.51 g of the desired product (56.0%, colorless solid).

Workup

  1. temperaturecooling
  2. stirringthe mixture was stirred at room temperature for 30 minutes
  3. distillationAfter the solvent was distilled off
  4. additionethanol (60 ml) and 1N NaOH (40 ml) were added to the residue
  5. stirringby stirring for 1 hour
  6. addition1N HCl (40 ml) was added
  7. distillationethanol was distilled off
  8. extractionthe residue was extracted with chloroform
  9. dry with materialdried over anhydrous magnesium sulfate
  10. distillationAfter the solvent was distilled off
  11. customthe residue was purified by column chromatography (eluent: ethyl acetate/ethanol=10:1)

Sources & evidence

ORD record
ord-d34a489740ed4a9e8f386753fe5c41ad
Source dataset
uspto-grants-1993_09
Patent number
US05244908

Linked notes

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