Acetic Anhydride → 3-Acetoxy-4-hydroxy-benzoic acid ethyl ester

HRID 2094740Notes

Reaction equation

HRID 2094740 reaction equation
[CH2:1]([O:3][C:4](=[O:13])[C:5]1[CH:10]=[CH:9][C:8]([OH:11])=[C:7]([OH:12])[CH:6]=1)[CH3:2].[CH3:14][C:15](C)([O-:17])C.[K+].C(OC(=O)C)(=O)C>CN(C=O)C>[CH2:1]([O:3][C:4](=[O:13])[C:5]1[CH:10]=[CH:9][C:8]([OH:11])=[C:7]([O:12][C:15](=[O:17])[CH3:14])[CH:6]=1)[CH3:2]

Participants

5

Reactant 3

HCID 7918Acetic AnhydrideHCID 77547Ethyl 3,4-DihydroxybenzoateHCID 23665647Potassium tert-butoxide

Product 1

HCID 671701733-Acetoxy-4-hydroxy-benzoic acid ethyl ester

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

3,4-Dihydroxy-benzoic acid ethyl ester (550 mg, 3.02 mmol) was dissolved in DMF (5 ml), potassium tert-butoxide (210 mg, 2.87 mmol) was added and the mixture stirred for 10 min. Acetic anhydride (339 mg, 3.32 mmol) was added and stirring continued for 10 min. The mixture was partitioned between EA and 2 N hydrochloric acid, and the aqueous phase extracted with EA. The combined organic phases were dried over sodium chloride, decanted and evaporated to dryness. The residue was purified by RP HPLC (water/ACN gradient).

Workup

  1. stirringstirring
  2. waitcontinued for 10 min
  3. customThe mixture was partitioned between EA and 2 N hydrochloric acid
  4. extractionthe aqueous phase extracted with EA
  5. dry with materialThe combined organic phases were dried over sodium chloride
  6. customdecanted
  7. customevaporated to dryness
  8. customThe residue was purified by RP HPLC (water/ACN gradient)

Sources & evidence

ORD record
ord-5477f436c8f040e8b1a4d2c9729de22b
Source dataset
uspto-grants-2013_05
Patent number
US08445530B2

Reaction notes

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