Methanol → methyl 5-[N-acetyl-N-(2-methoxyethyl)amino]-4,7-dihydro-4,7-dioxobenzo[b]thiophene-2-carboxylate

HRID 1582186Notes

Reaction equation

HRID 1582186 reaction equation
[CH3:1][O:2][CH2:3][CH2:4][NH:5][C:6]1[C:7](=[O:20])[C:8]2[CH:12]=[C:11]([C:13]([O:15][CH3:16])=[O:14])[S:10][C:9]=2[C:17](=[O:19])[CH:18]=1.CO.[C:23](OC(=O)C)(=[O:25])[CH3:24]>S(=O)(=O)(O)O>[C:23]([N:5]([C:6]1[C:7](=[O:20])[C:8]2[CH:12]=[C:11]([C:13]([O:15][CH3:16])=[O:14])[S:10][C:9]=2[C:17](=[O:19])[CH:18]=1)[CH2:4][CH2:3][O:2][CH3:1])(=[O:25])[CH3:24]

Participants

5

Reactant 3

HCID 887MethanolHCID 7918Acetic AnhydrideHCID 12987499Methyl 4,7-dihydro-5-(2-methoxyethyl)amino-4,7-dioxobenzo[b]thiophene-2-carboxylate

Product 1

HCID 12987500methyl 5-[N-acetyl-N-(2-methoxyethyl)amino]-4,7-dihydro-4,7-dioxobenzo[b]thiophene-2-carboxylate

Reagents, catalysts & solvents 1

HCID 1118Sulfuric AcidCatalyst

Procedure

Five drops of concentrated sulfuric acid was added to a solution of methyl 4,7-dihydro-5-(2-methoxyethyl)amino-4,7-dioxobenzo[b]thiophene-2-carboxylate (1.2 g) in acetic anhydride (20 ml) and the mixture was stirred at room temperature for 1 hour. Methanol (20 ml) was gradually added to the reaction solution and then the solvent was evaporated. Water was added to the residue and the mixture was extracted with ethyl acetate. The organic layer was washed with water and brine and then dried over anhydrous sodium sulfate. After evaporation of the solvent, the residue was purified by silica gel column chromatography (elution with ethyl acetate-hexane 1:1 solution) to give methyl 5-[N-acetyl-N-(2-methoxyethyl)amino]-4,7-dihydro-4,7-dioxobenzo[b]thiophene-2-carboxylate (0.39 g) as a reddish brown powder.

Workup

  1. customthe solvent was evaporated
  2. additionWater was added to the residue
  3. extractionthe mixture was extracted with ethyl acetate
  4. washThe organic layer was washed with water and brine
  5. dry with materialdried over anhydrous sodium sulfate
  6. customAfter evaporation of the solvent
  7. customthe residue was purified by silica gel column chromatography (elution with ethyl acetate-hexane 1:1 solution)

Sources & evidence

ORD record
ord-2e2bbaa28f084a4fad4e4dc16740994c
Source dataset
uspto-grants-2004_05
Patent number
US06734203B2

Reaction notes

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