Pyridine → Acetyl syringic acid

HRID 1613326Notes

Reaction equation

HRID 1613326 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:9]=[C:10]([O:13][CH3:14])[C:11]=1[OH:12])[C:6]([OH:8])=[O:7].[C:15](OC(=O)C)(=[O:17])[CH3:16].N1C=CC=CC=1>O>[C:15]([O:12][C:11]1[C:10]([O:13][CH3:14])=[CH:9][C:5]([C:6]([OH:8])=[O:7])=[CH:4][C:3]=1[O:2][CH3:1])(=[O:17])[CH3:16]

Participants

5

Reactant 3

HCID 1049PyridineHCID 7918Acetic AnhydrideHCID 10742Syringic Acid

Product 1

HCID 225680Acetyl syringic acid

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

To a mixture of 3,5-dimethoxy-4-hydroxybenzoic acid (3.00 g) and acetic anhydride (30 ml) was dropwise added pyridine (15 ml) with ice-cooling over a 5 minutes period. After stirring at room temperature for 30 minutes, the reaction mixture was poured into water and stirred at room temperature for 30 minutes followed by extracting thrice with ethyl acetate. The combined extract was washed with 10% hydrochloric acid, dried and concentrated. The residue was recrystallised from a mixture of methylene chloride and hexane to afford the title compound (3.13 g), melting at 192°-194° C.

Workup

  1. temperaturecooling over a 5 minutes period
  2. stirringstirred at room temperature for 30 minutes
  3. extractionby extracting thrice with ethyl acetate
  4. extractionThe combined extract
  5. washwas washed with 10% hydrochloric acid
  6. customdried
  7. concentrationconcentrated
  8. customThe residue was recrystallised from a mixture of methylene chloride and hexane

Sources & evidence

ORD record
ord-7b4589cf5fb9451c85745e93beb6db42
Source dataset
uspto-grants-1993_03
Patent number
US05192766

Reaction notes

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