Trifluoroacetic acid → 3-(piperidin-4-yl)-3,4-dihydroquinolin-2(1H)-one

HRID 132336Notes

Reaction equation

HRID 132336 reaction equation
FC(F)(F)C(O)=O.[O:8]=[C:9]1[CH:18]([CH:19]2[CH2:24][CH2:23][N:22](C(OC(C)(C)C)=O)[CH2:21][CH2:20]2)[CH2:17][C:16]2[C:11](=[CH:12][CH:13]=[CH:14][CH:15]=2)[NH:10]1>ClCCl>[NH:22]1[CH2:21][CH2:20][CH:19]([CH:18]2[CH2:17][C:16]3[C:11](=[CH:12][CH:13]=[CH:14][CH:15]=3)[NH:10][C:9]2=[O:8])[CH2:24][CH2:23]1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 59731916tert-Butyl 4-(2-oxo-1,2,3,4-tetrahydroquinolin-3-yl)piperidine-1-carboxylate

Product 1

HCID 183212463-(piperidin-4-yl)-3,4-dihydroquinolin-2(1H)-one

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Trifluoroacetic acid (3 mL) was added to a solution of tert-Butyl 4-(2-oxo-1,2,3,4-tetrahydroquinolin-3-yl)piperidine-1-carboxylate (260 mg, 0.79 mmol) in dichloromethane (3 mL). Reaction stirred at room temperature for 1 hour. Reaction mixture was concentrated in vacuo. Residue was dissolved in methanol. Dowex 1x4-200 ion exchange resin was added to the mixture to create a slurry. Mixture stirred at room temperature for 30 minutes. Resin was filtered off and washed with methanol. Filtrate was concentrated. Title compound was obtained as dark foam in quantitative yield. MS m/e (M+H)+=231.1.

Workup

  1. customReaction
  2. customReaction mixture
  3. concentrationwas concentrated in vacuo
  4. dissolutionResidue was dissolved in methanol
  5. additionDowex 1x4-200 ion exchange resin was added to the mixture
  6. stirringMixture stirred at room temperature for 30 minutes
  7. filtrationResin was filtered off
  8. washwashed with methanol
  9. concentrationFiltrate was concentrated

Sources & evidence

ORD record
ord-8cec90af9a484cebab993eae16497af6
Source dataset
uspto-grants-2008_06
Patent number
US07384931B2

Reaction notes

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