Sodium Hydroxide → (2S)-2-Ethoxy-3-(4-hydroxyphenyl)propanoic acid

HRID 351510Notes

Reaction equation

HRID 351510 reaction equation
[CH2:1]([O:3][CH:4]([CH2:10][C:11]1[CH:16]=[CH:15][C:14]([OH:17])=[CH:13][CH:12]=1)[C:5]([O:7]CC)=[O:6])[CH3:2].[OH-].[Na+]>P([O-])([O-])([O-])=O>[CH2:1]([O:3][C@@H:4]([CH2:10][C:11]1[CH:12]=[CH:13][C:14]([OH:17])=[CH:15][CH:16]=1)[C:5]([OH:7])=[O:6])[CH3:2]

Participants

4

Reactant 2

HCID 14798Sodium HydroxideHCID 11791243Ethyl 2-ethoxy-3-(4-hydroxyphenyl)propanoate

Product 1

HCID 9837207(2S)-2-Ethoxy-3-(4-hydroxyphenyl)propanoic acidYield 40.8%

Reagents, catalysts & solvents 1

HCID 1061PhosphateSolvent

Procedure

Ethyl (2R/S) (+/−) 2-ethoxy-3-(4-hydroxyphenyl)propanoate (5 g) was added to an aqueous 0.1 M phosphate buffer pH 7 (10 ml). 100 mg of the lyophilised hydrolytic enzyme mixture from Aspergillus oryzae was added and the mixture was stirred for 18 hours at room temperature. During that time, the pH of the reaction mixture was kept constant at pH=6-8 by addition of NaOH. Most of the water was evaporated in vacuo. Methanol was added to the remaining slurry in order to stop the hydrolysis. The precipitate, which formed was filtered off and the methanol was evaporated in vacuo. The remaining oil was dissolved in water followed by extraction of unreacted ester with TMBE (CCE method 2: eeester=87%). The water phase was acidified to pH=3 and the acid extracted with TMBE. After drying over Na2SO4 and evaporation of the TMBE, 1.8 g (2S)-2-Ethoxy-3-(4-hydroxyphenyl)propanoic acid was obtained as an oil, which crystallized on standing (m.p.=105° C., CCE method 2: eeacid=>99%).

Workup

  1. addition100 mg of the lyophilised hydrolytic enzyme mixture from Aspergillus oryzae was added
  2. customMost of the water was evaporated in vacuo
  3. additionMethanol was added to the remaining slurry in order
  4. customthe hydrolysis
  5. customThe precipitate, which formed
  6. filtrationwas filtered off
  7. customthe methanol was evaporated in vacuo
  8. dissolutionThe remaining oil was dissolved in water
  9. extractionfollowed by extraction of unreacted ester with TMBE (CCE method 2: eeester=87%)
  10. extractionthe acid extracted with TMBE
  11. dry with materialAfter drying over Na2SO4 and evaporation of the TMBE

Sources & evidence

ORD record
ord-b42e0c1f7ce640a2ae0a02c94c2e8b44
Source dataset
uspto-grants-2004_06
Patent number
US06743608B2

Reaction notes

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