Citric Acid → (2-{7-[[(2-methoxyphenyl)sulfonyl](methyl)amino]-1H-indol-2-yl}-4,5-dihydro-1,3-thiazol-5-yl)acetic acid

HRID 1960489Notes

Reaction equation

HRID 1960489 reaction equation
C([O:3][C:4](=[O:33])[CH2:5][CH:6]1[S:10][C:9]([C:11]2[NH:12][C:13]3[C:18]([CH:19]=2)=[CH:17][CH:16]=[CH:15][C:14]=3[N:20]([S:22]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=2[O:31][CH3:32])(=[O:24])=[O:23])[CH3:21])=[N:8][CH2:7]1)C.[OH-].[K+].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>O1CCCC1.CO>[CH3:32][O:31][C:26]1[CH:27]=[CH:28][CH:29]=[CH:30][C:25]=1[S:22]([N:20]([CH3:21])[C:14]1[CH:15]=[CH:16][CH:17]=[C:18]2[C:13]=1[NH:12][C:11]([C:9]1[S:10][CH:6]([CH2:5][C:4]([OH:33])=[O:3])[CH2:7][N:8]=1)=[CH:19]2)(=[O:23])=[O:24]

Participants

6

Reactant 3

HCID 311Citric AcidHCID 14797Potassium HydroxideHCID 59135846Ethyl(2-{7-[[(2-methoxyphenyl)sulfonyl](methyl)amino]-1H-indol-2-yl}-4,5-dihydro-1,3-thiazol-5-yl)acetate

Product 1

HCID 59135901(2-{7-[[(2-methoxyphenyl)sulfonyl](methyl)amino]-1H-indol-2-yl}-4,5-dihydro-1,3-thiazol-5-yl)acetic acidYield 78%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

Ethyl(2-{7-[[(2-methoxyphenyl)sulfonyl](methyl)amino]-1H-indol-2-yl}-4,5-dihydro-1,3-thiazol-5-yl)acetate (1.0 g) was dissolved in a mixed solvent of tetrahydrofuran (10 mL)-methanol (10 mL). Aqueous potassium hydroxide solution (prepared by dissolving potassium hydroxide (0.50 g) in water (5 mL)) was added to this solution, and the mixture was stirred at room temperature for 7 hr. The reaction solution was acidified with aqueous citric acid solution, and extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained pale-brown oil was crystallized from ethyl acetate-hexane to give the title compound (730 mg, yield: 78%) as pale-yellow crystals. MS:460(MH+). melting point 197-198° C.

Workup

  1. extractionextracted with ethyl acetate
  2. washThe organic layer was washed with saturated brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationconcentrated under reduced pressure
  5. customThe obtained pale-brown oil was crystallized from ethyl acetate-hexane

Sources & evidence

ORD record
ord-daeb806d6a254cd0b17c474c19a8f712
Source dataset
uspto-grants-2013_04
Patent number
US08410087B2

Reaction notes

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