Phthalic Anhydride → HCID 46939375, compound

HRID 2212262Notes

Reaction equation

HRID 2212262 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[C:10]([C:11]2[CH:16]=[CH:15][CH:14]=[C:13]([Cl:17])[CH:12]=2)=[CH:9][S:8][C:7]=1[NH2:18])=[O:5])[CH3:2].[C:19]1(=O)[O:24][C:22](=[O:23])[C:21]2=[CH:25][CH:26]=[CH:27][CH:28]=[C:20]12>C(O)(=O)C>[CH2:1]([O:3][C:4]([C:6]1[C:10]([C:11]2[CH:16]=[CH:15][CH:14]=[C:13]([Cl:17])[CH:12]=2)=[CH:9][S:8][C:7]=1[N:18]1[C:22](=[O:23])[C:21]2[C:20](=[CH:28][CH:27]=[CH:26][CH:25]=2)[C:19]1=[O:24])=[O:5])[CH3:2]

Participants

4

Reactant 2

HCID 6811Phthalic AnhydrideHCID 40547758HCID 40547758, compound

Product 1

HCID 46939375HCID 46939375, compoundYield 80%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

A mixture of 2-amino-4-(3-chlorophenyl)thiophene-3-carboxylic acid ethyl ester (2 mmol, Example 4 & 5, Part B) and phthalic anhydride (2.2 mmol) in glacial acetic acid (20 mL) was heated at reflux overnight. After cooling to room temperature, the acetic acid was removed in vacuo and the residue triturated with petroleum ether. The crude product was collected by filtration, suspended in acetyl chloride (5 mL), and heated to reflux for one hour. After removing the solvent in vacuo, the residue was dissolved in ethyl acetate (30 mL), washed sequentially with 5% aqueous NaHCO3 (10 mL), water (10 mL), brine (10 mL), dried (Na2SO4), filtered, and concentrated in vacuo. Recrystallization from petroleum ether afforded the desired product as a yellow solid in 80% yield.

Workup

  1. temperaturewas heated
  2. temperatureat reflux overnight
  3. customthe acetic acid was removed in vacuo
  4. customthe residue triturated with petroleum ether
  5. filtrationThe crude product was collected by filtration
  6. temperatureheated
  7. temperatureto reflux for one hour
  8. customAfter removing the solvent in vacuo
  9. dissolutionthe residue was dissolved in ethyl acetate (30 mL)
  10. washwashed sequentially with 5% aqueous NaHCO3 (10 mL), water (10 mL), brine (10 mL)
  11. dry with materialdried (Na2SO4)
  12. filtrationfiltered
  13. concentrationconcentrated in vacuo
  14. customRecrystallization from petroleum ether

Sources & evidence

ORD record
ord-4911c010652f44c680d3363c857d8299
Source dataset
uspto-grants-2006_09
Patent number
US07101905B2

Reaction notes

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