Lithium Hydroxide → 4-(Quinoline-8-sulfonamido)benzoic acid

HRID 1626328Notes

Reaction equation

HRID 1626328 reaction equation
[N:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][C:9]=2[S:11]([NH:14][C:15]2[CH:25]=[CH:24][C:18]([C:19]([O:21]CC)=[O:20])=[CH:17][CH:16]=2)(=[O:13])=[O:12])[CH:4]=[CH:3][CH:2]=1.[Li+].[OH-]>C1COCC1.O>[N:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][C:9]=2[S:11]([NH:14][C:15]2[CH:25]=[CH:24][C:18]([C:19]([OH:21])=[O:20])=[CH:17][CH:16]=2)(=[O:13])=[O:12])[CH:4]=[CH:3][CH:2]=1

Participants

5

Reactant 2

HCID 3939Lithium HydroxideHCID 1357549Ethyl 4-(quinoline-8-sulfonamido)benzoate

Product 1

HCID 7766454-(Quinoline-8-sulfonamido)benzoic acidYield 95.8%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
80 °C

Procedure

To a solution of sulfonamide 90 (34 gm, 95.5 mmol) in THF and water (1:1), LiOH (20 gm, 47.66 mmol) was added and the resulting mixture was allowed to stir at 80° C. overnight. After completion of reaction, the crude mixture was washed with EtOAc. The aqueous layer was acidified with citric acid and filtered. Thus obtained solid was washed with Et2O and azeotroped by toluene, under reduced pressure to afford acid 91 (30 gm, 95.8% yield) which was taken forward for the next step without further purification.

Workup

  1. customAfter completion of reaction
  2. washthe crude mixture was washed with EtOAc
  3. filtrationfiltered
  4. washThus obtained solid was washed with Et2O
  5. customazeotroped by toluene, under reduced pressure

Sources & evidence

ORD record
ord-e20a7dfbba42489db805e9108a695cc2
Source dataset
uspto-grants-2014_07
Patent number
US08785450B2

Reaction notes

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