Hydrogen Bromide → Methyl 2-hydroxy-5-(oxoacetyl)benzoate--water (1/1)

HRID 1974680Notes

Reaction equation

HRID 1974680 reaction equation
[C:1]([C:4]1[CH:13]=[C:8]([C:9]([O:11][CH3:12])=[O:10])[C:7]([OH:14])=[CH:6][CH:5]=1)(=[O:3])[CH3:2].C([OH:18])(C)C.CS(C)=O.Br>C(Cl)Cl>[OH2:3].[CH3:12][O:11][C:9](=[O:10])[C:8]1[C:7](=[CH:6][CH:5]=[C:4]([C:1](=[O:3])[CH:2]=[O:18])[CH:13]=1)[OH:14]

Participants

6

Reactant 4

HCID 260Hydrogen Bromide2×HCID 679Dimethyl SulfoxideHCID 3776IsopropanolHCID 85444Methyl 5-acetylsalicylate

Product 1

HCID 44118540Methyl 2-hydroxy-5-(oxoacetyl)benzoate--water (1/1)Yield 85%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
15 °C

Procedure

To a 3-neck flask immersed in an oil bath containing a solution of 40 g (0.206 mole) methyl 5-acetylsalicylate in 6 ml methylene chloride is charged with 82 ml of isopropanol. The solution is distilled to remove excess methylene chloride. When the internal temperature reaches 77° C., 126 ml (1.77 mole or 8.6 equivalents) of DMSO is added to the reaction mixture and the temperature of the mixture is increased to a temperature of 85° to 90° C. Then 33 ml (0.29 mole or 1.4 equivalents) or HBr (aqueous, 48%) is added to the mixture over a period of 20 minutes (exothermic), and the bath temperature is maintained at 95° to 100° C. As the addition of HBr nears completion distillation is initiated and dimethysulfide and isopropanol are distilled off. The mixture is stirred and the volume of the distillate monitored. After distillation of 82 ml of solvent, 20 ml of IPA is added slowly to maintain a steady rate of distillation. After the reaction completed as determined by high performance liquid chromatography (HPLC), the reaction mixture is quenched with 70 ml of 2.4N H2SO4, the temperature of the reaction mixture is allowed to drop to 75° C. and residual isopropanol is distilled off under vacuum. After a total of 165 ml distillate is collected, the title compound begins to precipitate. A mixture of 30 ml of acetonitrile (CH3CN) and 70 ml of water is added slowly at 75° C. with stirring. After 30 minutes of stirring, the reaction mixture is cooled to 15° C. over a period of 90 minutes to complete the precipitation. The reaction mixture is filtered and the cake is washed with three 300 ml portions of water. The cake is dried in a draft oven at 50° C. for 16 hours to give 39.5 g of the title compound (85% yield).

Workup

  1. customTo a 3-neck flask immersed in an oil bath
  2. distillationThe solution is distilled
  3. customto remove excess methylene chloride
  4. customreaches 77° C.
  5. temperaturethe temperature of the mixture is increased to a temperature of 85° to 90° C
  6. temperaturethe bath temperature is maintained at 95° to 100° C
  7. distillationnears completion distillation
  8. distillationdimethysulfide and isopropanol are distilled off
  9. distillationAfter distillation of 82 ml of solvent, 20 ml of IPA
  10. additionis added slowly
  11. temperatureto maintain
  12. distillationa steady rate of distillation
  13. customthe reaction mixture is quenched with 70 ml of 2.4N H2SO4
  14. customto drop to 75° C.
  15. distillationresidual isopropanol is distilled off under vacuum
  16. distillationAfter a total of 165 ml distillate is collected
  17. customto precipitate
  18. additionA mixture of 30 ml of acetonitrile (CH3CN) and 70 ml of water
  19. additionis added slowly at 75° C.
  20. stirringwith stirring
  21. stirringAfter 30 minutes of stirring
  22. customthe precipitation
  23. filtrationThe reaction mixture is filtered
  24. washthe cake is washed with three 300 ml portions of water
  25. customThe cake is dried in a draft oven at 50° C. for 16 hours

Sources & evidence

ORD record
ord-9ccea3e3ea774d8eb615f6112a3aee39
Source dataset
uspto-grants-1994_02
Patent number
US05283359

Reaction notes

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