Citric Acid → HCID 57901852, compound

HRID 1851460Notes

Reaction equation

HRID 1851460 reaction equation
[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([NH:11][C:12]2[CH:13]=[CH:14][CH:15]=[C:16]3[C:20]=2[NH:19][C:18]([C:21]([O:23]CC)=[O:22])=[CH:17]3)(=[O:10])=[O:9])=[CH:4][CH:3]=1.CO.[OH-].[K+].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>O1CCCC1>[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([NH:11][C:12]2[CH:13]=[CH:14][CH:15]=[C:16]3[C:20]=2[NH:19][C:18]([C:21]([OH:23])=[O:22])=[CH:17]3)(=[O:9])=[O:10])=[CH:4][CH:3]=1

Participants

6

Reactant 4

HCID 311Citric AcidHCID 887MethanolHCID 14797Potassium HydroxideHCID 3604734HCID 3604734, compound

Product 1

HCID 57901852HCID 57901852, compoundYield 95.1%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a mixed solution of ethyl 7-{[(4-methylphenyl)sulfonyl]amino}-1H-indole-2-carboxylate (356 mg) in tetrahydrofuran (6 mL)-methanol (6 mL) was added aqueous solution (3 mL) of 85% potassium hydroxide (450 mg), and the mixture was stirred at room temperature for 18 hr. Aqueous citric acid solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate, washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained crystals were washed with ethyl acetate-hexane to give the title compound (312 mg, yield 95%) as pale-yellow crystals. melting point 268-269° C.

Workup

  1. extractionthe mixture was extracted with ethyl acetate
  2. washwashed with saturated brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationconcentrated under reduced pressure
  5. washThe obtained crystals were washed with ethyl acetate-hexane

Sources & evidence

ORD record
ord-d76c22ea8162455d9a9bfc4bf2aafb77
Source dataset
uspto-grants-2015_02
Patent number
US08957070B2

Reaction notes

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