Aniline → 4-Amino-3'-fluorobenzophenone

HRID 327204Notes

Reaction equation

HRID 327204 reaction equation
[F:1][C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][CH:10]=1)[C:5]([OH:7])=O.[NH2:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1>>[NH2:11][C:12]1[CH:17]=[CH:16][C:15]([C:5]([C:4]2[CH:8]=[CH:9][CH:10]=[C:2]([F:1])[CH:3]=2)=[O:7])=[CH:14][CH:13]=1

Participants

3

Reactant 2

HCID 6115AnilineHCID 99683-Fluorobenzoic Acid

Product 1

HCID 107987124-Amino-3'-fluorobenzophenoneYield 299.2%

Procedure

To stirred 90° C. polyphosphoric acid (150 g) was added 10.72 g (7.65 mmol) of 3-fluorobenzoic acid and 6.98 g (7.5 mmol) of aniline and the bath temperature raised to 180°-190° C. and held there for 1 hour. A solution was obtained at about 130° C. The heating bath was removed and the stirred mixture (sublimate above the solution) was treated cautiously with 60 mL of water. The mixture was stirred at 140°-155° C. for 1 hour, the heating bath removed, 50 mL of 3N HCl added, the mixture poured into 750 mL of water and filtered through a pad of Celite. The filtrate was basified with 15% sodium hydroxide and the resulting solid extracted-with methylene chloride. The dried (MgSO4) solution was filtered and the solvent removed to yield a brown solid. Recrystallization from ethanol-hexane (1:3) returned a greenish yellow solid that was chromatographed on silica gel (methylene chloride) to yield 4.83 g (30%) of yellow 4-amino-3'-fluorobenzophenone, mp 98°-100° C. 1H NMR (300 MHz, CDCl3): 4.21 (s, 2H, NH2) 6.66-6.70 (m, 2H, aromatic) 7.23-7.26 (m, 1H, aromatic) 7.39-7.51 (m, 3H, aromatic) 7.69-7.72 (m, 2H, aromatic). MS (CI, CH4): 216 (M+1).

Workup

  1. temperaturethe bath temperature raised to 180°-190° C.
  2. customA solution was obtained at about 130° C
  3. customThe heating bath was removed
  4. additionthe stirred mixture (sublimate above the solution) was treated cautiously with 60 mL of water
  5. customthe heating bath removed
  6. addition50 mL of 3N HCl added
  7. additionthe mixture poured into 750 mL of water
  8. filtrationfiltered through a pad of Celite
  9. dry with materialThe dried (MgSO4) solution
  10. filtrationwas filtered
  11. customthe solvent removed
  12. customto yield a brown solid
  13. customRecrystallization from ethanol-hexane (1:3)
  14. customthat was chromatographed on silica gel (methylene chloride)

Sources & evidence

ORD record
ord-92c7fc899d964af0a3de9ef218d6f468
Source dataset
uspto-grants-1993_12
Patent number
US05272163

Reaction notes

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