Sulfuric Acid → Benzo(b)thiophene-2-carboxylic acid

HRID 975311

Reaction equation

HRID 975311 reaction equation
[S-2].[Na+].[Na+].[S].ClC1C=CC=CC=1C=O.ClCC(OC)=O.C[O-].[Na+].[S:23]1[C:27]([C:28]([O:30]C)=[O:29])=[CH:26][C:25]2[CH:32]=[CH:33][CH:34]=[CH:35][C:24]1=2.[OH-].[Na+].S(=O)(=O)(O)O>C1(C)C=CC=CC=1.O.CN(C)C=O>[S:23]1[C:27]([C:28]([OH:30])=[O:29])=[CH:26][C:25]2[CH:32]=[CH:33][CH:34]=[CH:35][C:24]1=2

Participants

12

Reactant 8

HCID 1118Sulfuric AcidHCID 69962-ChlorobenzaldehydeHCID 7295Methyl chloroacetateHCID 14798Sodium HydroxideHCID 14804Sodium SulfideHCID 2800344Methyl benzo(b)thiophene-2-carboxylateHCID 5362487SulfurHCID 10942334Sodium Methoxide

Product 1

HCID 95864Benzo(b)thiophene-2-carboxylic acid

Reagents, catalysts & solvents 3

HCID 962WaterSolvent2×HCID 1140TolueneSolventHCID 6228DimethylformamideSolvent

Procedure

Into a 200-ml four-necked flask equipped with a stirrer, a thermometer and a reflux condenser were fed 14.1 g (0.18 mole) of anhydrous sodium sulfide, 5.8 g (0.18 mole) of sulfur and 45 ml of dimethylformamide. The mixture was stirred at room temperature. Heat generation occurred and the mixture temperature increased to 45° C. After the completion of the heat generation, 21.1 g (0.15 mole) of 2-chlorobenzaldehyde was dropwise added in 10 minutes at 70°-75° C. with slight heating. The mixture was stirred at the same temperature for 4 hours. The reaction mixture was cooled to room temperature. To the mixture being stirred was dropwise added 16.3 g (0.15 mole) of methyl chloroacetate in 10 minutes under spontaneous heat generation. The mixture was stirred at 55°-60° C. for 1.5 hours. 8.1 g (0.15 mole) of sodium methoxide was added at the same temperature, followed by stirring for 30 minutes. The reaction mixture was analyzed by gas chromatography, which indicated the formation of methyl benzo[b]thiophene-2-carboxylate in an amount of 86% by areal ratio. The reaction mixture was stirred for a further 1 hour. 40 ml of water and 6 g of 48% sodium hydroxide were added and the mixture was stirred at 95° C. for 1.5 hours to give rise to hydrolysis. After the completion of the reaction, dilution with 100 ml of water was conducted. 100 ml of toluene was added and extraction was conducted at 75° C. to remove neutral components. The aqueous layer was placed in a 1-litter beaker. Thereto was dropwise added 22.1 g (0.21 mole) of 95% sulfuric acid with stirring. The resulting crystals were collected by filtration and dried to obtain 17.6 g of crude benzo[b]thiophene-2-carboxylic acid. This product was washed with toluene and redried to obtain 17.1 g of benzo[b]thiophene-2-carboxylic acid. The yield was 64.0% and the purity was 99.7%.

Workup

  1. customInto a 200-ml four-necked flask equipped with a stirrer
  2. temperatureHeat generation
  3. temperaturethe mixture temperature increased to 45° C
  4. stirringThe mixture was stirred at the same temperature for 4 hours
  5. temperatureThe reaction mixture was cooled to room temperature
  6. stirringTo the mixture being stirred
  7. customin 10 minutes
  8. stirringThe mixture was stirred at 55°-60° C. for 1.5 hours
  9. stirringby stirring for 30 minutes
  10. stirringThe reaction mixture was stirred for a further 1 hour
  11. stirringthe mixture was stirred at 95° C. for 1.5 hours
  12. customto give rise
  13. customto hydrolysis
  14. extractionextraction
  15. customwas conducted at 75° C.
  16. customto remove neutral components
  17. stirringwith stirring
  18. filtrationThe resulting crystals were collected by filtration
  19. customdried

Sources & evidence

ORD record
ord-64854ada786a43618b3d809ec0b1c9b6
Source dataset
uspto-grants-1997_03
Patent number
US05608080

Linked notes

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