2-Aminobenzonitrile → 4-Amino-1,2-dihydroquinolin-2-one

HRID 1883938Notes

Reaction equation

HRID 1883938 reaction equation
[Li+].C[Si]([N-][Si](C)(C)C)(C)C.[C:11]([OH:14])(=O)[CH3:12].N1C2C=CC=CC=2NC=1.[NH2:24][C:25]1[CH:32]=[CH:31][CH:30]=[CH:29][C:26]=1[C:27]#[N:28]>C1COCC1>[NH2:28][C:27]1[C:26]2[C:25](=[CH:32][CH:31]=[CH:30][CH:29]=2)[NH:24][C:11](=[O:14])[CH:12]=1

Participants

5

Reactant 3

HCID 729132-AminobenzonitrileHCID 2733832Lithium HexamethyldisilazideHCID 67199695Benzimidazole acetate

Product 1

HCID 4596664-Amino-1,2-dihydroquinolin-2-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

LiHMDS (3-4 eq) was added to the benzimidazole acetate (1.0 eq) in THF (at a constant temperature ranging from −78° C. to 0° C.). After 20 minutes, a solution of the 2-aminobenzonitrile (1.1 eq) in THF was then added. The resulting mixture was allowed to warm to room temperature, stirred for 1-3 hours and was then heated to approx. 40° C.-65° C. (1 hour to 12 hours). The mixture was cooled to 0° C. and quenched with NH4Cl (aq, saturated). The aqueous phase was extracted with CH2Cl2 or EtOAc, and the organic extracts were collected, dried (Na2SO4), and filtered. Evaporation of the solvent under reduced pressure and purification of the residue by silica gel chromatography or HPLC provided the 4-amino quinolinone products.

Workup

  1. customranging from −78° C. to 0° C.
  2. temperaturewas then heated to approx. 40° C.-65° C. (1 hour to 12 hours)
  3. temperatureThe mixture was cooled to 0° C.
  4. customquenched with NH4Cl (aq, saturated)
  5. extractionThe aqueous phase was extracted with CH2Cl2 or EtOAc
  6. customthe organic extracts were collected
  7. dry with materialdried (Na2SO4)
  8. filtrationfiltered
  9. customEvaporation of the solvent
  10. customunder reduced pressure and purification of the residue by silica gel chromatography or HPLC

Sources & evidence

ORD record
ord-fb2e73ddf73e40a79395401f02d65281
Source dataset
uspto-grants-2004_07
Patent number
US06762194B2

Reaction notes

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