Tetrahydrofuran → 5-(2-methoxyethoxy)-7-[(pyridin-2-ylsulfonyl)amino]-1H-indole-2-carboxylic acid

HRID 1960395Notes

Reaction equation

HRID 1960395 reaction equation
[CH3:1][O:2][CH2:3][CH2:4][O:5][C:6]1[CH:7]=[C:8]2[C:12](=[C:13]([NH:15][S:16]([C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][N:20]=3)(=[O:18])=[O:17])[CH:14]=1)[NH:11][C:10]([C:25]([O:27]CC)=[O:26])=[CH:9]2.O1CCCC1.[OH-].[K+]>CO>[CH3:1][O:2][CH2:3][CH2:4][O:5][C:6]1[CH:7]=[C:8]2[C:12](=[C:13]([NH:15][S:16]([C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][N:20]=3)(=[O:17])=[O:18])[CH:14]=1)[NH:11][C:10]([C:25]([OH:27])=[O:26])=[CH:9]2

Participants

5

Reactant 3

HCID 8028TetrahydrofuranHCID 14797Potassium HydroxideHCID 57476206ethyl 5-(2-methoxyethoxy)-7-[(pyridin-2-ylsulfonyl)amino]-1H-indole-2-carboxylate

Product 1

HCID 574762055-(2-methoxyethoxy)-7-[(pyridin-2-ylsulfonyl)amino]-1H-indole-2-carboxylic acidYield 84.1%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a mixture of ethyl 5-(2-methoxyethoxy)-7-[(pyridin-2-ylsulfonyl)amino]-1H-indole-2-carboxylate (5.40 g), tetrahydrofuran (50 mL) and methanol (50 mL) was added a 85% aqueous solution (30 mL) of potassium hydroxide (3.0 g), and the mixture was stirred at room temperature for 15 hr. The reaction mixture was concentrated, aqueous citric acid solution was added to the residue, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with water, and concentrated to give a white solid. The obtained solid was washed with a mixed solvent of ethyl acetate-hexane to give the title compound (4.24 g, yield 84%) as colorless crystals. melting point 230-232° C.

Workup

  1. concentrationThe reaction mixture was concentrated
  2. additionaqueous citric acid solution was added to the residue
  3. extractionthe mixture was extracted with ethyl acetate
  4. washThe ethyl acetate layer was washed with water
  5. concentrationconcentrated
  6. customto give a white solid
  7. washThe obtained solid was washed with a mixed solvent of ethyl acetate-hexane

Sources & evidence

ORD record
ord-9e1075faf87642d99570042ef6571a8a
Source dataset
uspto-grants-2013_04
Patent number
US08410087B2

Reaction notes

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