Phthalic Anhydride → HCID 67073561, compound

HRID 270177Notes

Reaction equation

HRID 270177 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[C:10]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=2[Cl:17])=[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]=[CH:13][C:12]=2[Cl:17])=[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 1990440ethyl 2-amino-4-(2-chlorophenyl)thiophene-3-carboxylate

Product 1

HCID 67073561HCID 67073561, compound

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

A mixture of 2-amino-4-(2-chlorophenyl)-thiophene-3-carboxylic acid ethyl ester (2 mmol, Example 8, Part B) and phthalic anhydride (2.2 mmol) in glacial acetic acid (20 mL) is heated at reflux overnight. After cooling to room temperature, the acetic acid is removed in vacuo and the residue triturated with petroleum ether. The crude product is collected by filtration, suspended in acetyl chloride (5 mL), and heated to reflux for one hour. After removing the solvent in vacuo, the residue is 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 affords the desired product.

Workup

  1. temperatureis heated
  2. temperatureat reflux overnight
  3. customthe acetic acid is removed in vacuo
  4. customthe residue triturated with petroleum ether
  5. filtrationThe crude product is collected by filtration
  6. temperatureheated
  7. temperatureto reflux for one hour
  8. customAfter removing the solvent in vacuo
  9. dissolutionthe residue is 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-53cb6af107bc41d5a61bc735bb4200e6
Source dataset
uspto-grants-2008_11
Patent number
US07449490B2

Reaction notes

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