Citric Acid → 5-(2-methoxyethoxy)-7-[methyl(2-thienylsulfonyl)amino]-1H-indole-2-carboxylic acid

HRID 1960380Notes

Reaction equation

HRID 1960380 reaction equation
[CH3:1][O:2][CH2:3][CH2:4][O:5][C:6]1[CH:7]=[C:8]2[C:12](=[C:13]([N:15]([CH3:24])[S:16]([C:19]3[S:20][CH:21]=[CH:22][CH:23]=3)(=[O:18])=[O:17])[CH:14]=1)[NH:11][C:10]([C:25]([O:27]CC)=[O:26])=[CH:9]2.[OH-].[Na+].O1CCCC1.C(O)(=O)CC(CC(O)=O)(C(O)=O)O>C(O)C>[CH3:1][O:2][CH2:3][CH2:4][O:5][C:6]1[CH:7]=[C:8]2[C:12](=[C:13]([N:15]([CH3:24])[S:16]([C:19]3[S:20][CH:21]=[CH:22][CH:23]=3)(=[O:17])=[O:18])[CH:14]=1)[NH:11][C:10]([C:25]([OH:27])=[O:26])=[CH:9]2

Participants

6

Reactant 4

HCID 311Citric AcidHCID 8028TetrahydrofuranHCID 14798Sodium HydroxideHCID 57476194ethyl 5-(2-methoxyethoxy)-7-[methyl(2-thienylsulfonyl)amino]-1H-indole-2-carboxylate

Product 1

HCID 575032095-(2-methoxyethoxy)-7-[methyl(2-thienylsulfonyl)amino]-1H-indole-2-carboxylic acidYield 94.5%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of ethyl 5-(2-methoxyethoxy)-7-[methyl(2-thienylsulfonyl)amino]-1H-indole-2-carboxylate (1.30 g), 1N aqueous sodium hydroxide solution (10 mL), tetrahydrofuran (10 mL) and ethanol (10 mL) was stirred at room temperature for 15 hr. The reaction mixture was acidified with aqueous citric acid solution, and extracted with ethyl acetate. The ethyl acetate layer was washed successively with water and saturated brine, dried (MgSO4), and concentrated to give the title compound (1.15 g, yield 93%) as colorless crystals. The crystals were recrystallized from ethyl acetate-hexane to give colorless prism crystals. melting point 198-199° C.

Workup

  1. extractionextracted with ethyl acetate
  2. washThe ethyl acetate layer was washed successively with water and saturated brine
  3. dry with materialdried (MgSO4)
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-2dc34606caea4f889afc0445e0d75952
Source dataset
uspto-grants-2013_04
Patent number
US08410087B2

Reaction notes

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