Hydrochloric Acid → HCID 21883652, compound

HRID 854948Notes

Reaction equation

HRID 854948 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[C:10]3[C:15](=[CH:16][CH:17]=2)[NH:14][CH:13]([C:18]([F:21])([F:20])[F:19])[C:12]([C:22]([O:24]CC)=[O:23])=[CH:11]3)=[CH:4][CH:3]=1.[OH-].[Li+].Cl.C(OCC)C>CO.O1CCCC1.O>[F:1][C:2]1[CH:3]=[CH:4][C:5]([C:8]2[CH:9]=[C:10]3[C:15](=[CH:16][CH:17]=2)[NH:14][CH:13]([C:18]([F:20])([F:21])[F:19])[C:12]([C:22]([OH:24])=[O:23])=[CH:11]3)=[CH:6][CH:7]=1

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 3283Diethyl EtherHCID 3939Lithium HydroxideHCID 69517324HCID 69517324, compound

Product 1

HCID 21883652HCID 21883652, compoundYield 88.2%

Reagents, catalysts & solvents 1

HCID 21892291Methanol tetrahydrofuran waterSolvent

Procedure

Ethyl 6-(4-fluorophenyl)-2-(trifluoromethyl)-1,2-dihydroquinoline-3-carboxylate (189 mg, 0.51 mmol) was suspended in methanol-tetrahydrofuran-water (10 mL, 7:2:1). Lithium hydroxide (42 mg, 0.1.53 mmol) was added, and the mixture was gently heated to reflux for two hours. The reaction was cooled to room temperature and 1 N aqueous hydrochloric acid added until pH=1. The organic solvent was removed in vauco to afford a suspension of a crude yellow solid. Diethyl ether (20 mL) was added, and the solution was washed with water (2×20 mL), saturated ammonium sulfate (2×20 mL), dried over sodium sulfate and filtered. The filtrate was concentrated in vacuo to yield 6-(4-fluorophenyl)-2-(trifluoromethyl)-1,2-dihydroquinoline-3-carboxylic acid (152 mg, 0.45 mmol) as a yellow solid (88% yield). 1H NMR (CD3OD3, 300 MHz) 7.81 (s, 1H), 7.40-7.56 (m, 4H), 7.10 (t, 1H, J=9.1 Hz), 6.78 (d, 1H, J=8.3 Mz), 5.12 (m, 1H). HRMS m/z 337.0732; calcd 337.0726.

Workup

  1. temperaturethe mixture was gently heated
  2. temperatureto reflux for two hours
  3. customThe organic solvent was removed in vauco
  4. customto afford
  5. additiona suspension of a crude yellow solid
  6. washthe solution was washed with water (2×20 mL), saturated ammonium sulfate (2×20 mL)
  7. dry with materialdried over sodium sulfate
  8. filtrationfiltered
  9. concentrationThe filtrate was concentrated in vacuo

Sources & evidence

ORD record
ord-3ef203eaf9b945c0a25f227790baa0b7
Source dataset
uspto-grants-2007_08
Patent number
US07259266B2

Reaction notes

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