Trifluoroacetic acid → 2-(3-Methoxy-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid methyl ester

HRID 2045397Notes

Reaction equation

HRID 2045397 reaction equation
[CH3:1][O:2][C:3]([C:5]1[CH:6]=[C:7]2[C:12](=[CH:13][CH:14]=1)[NH:11][CH:10]([C:15]1[CH:20]=[CH:19][CH:18]=[C:17]([O:21][CH3:22])[CH:16]=1)[C:9]([CH3:24])([CH3:23])[CH:8]2O)=[O:4].C([SiH](CC)CC)C.FC(F)(F)C(O)=O>>[CH3:1][O:2][C:3]([C:5]1[CH:6]=[C:7]2[C:12](=[CH:13][CH:14]=1)[NH:11][CH:10]([C:15]1[CH:20]=[CH:19][CH:18]=[C:17]([O:21][CH3:22])[CH:16]=1)[C:9]([CH3:24])([CH3:23])[CH2:8]2)=[O:4]

Participants

4

Reactant 3

HCID 6422Trifluoroacetic acidHCID 12052TriethylsilaneHCID 674419164-Hydroxy-2-(3-methoxy-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid methyl ester

Product 1

HCID 674425662-(3-Methoxy-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid methyl esterYield 50%

Conditions

Temperature
25 °C

Procedure

To a stirred mixture solution of 4-hydroxy-2-(3-methoxy-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid methyl ester (3.4 g, 10.2 mmol) and triethylsilane (6.0 mL) at 25° C. was added trifluoroacetic acid (3.0 mL) dropwise. The resulting mixture solution was stirred at 25° C. for 3 hours. Then the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (2×200 mL), washed with saturated aqueous sodium bicarbonate solution (4×100 mL), dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was triturated with methanol. The resulting precipitate was collected, dried in vacuo to afford 2-(3-methoxy-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid methyl ester (1.6 g, 50%) as a white solid: LC/MS m/e calcd for C20H23NO3 (M+H)+: 326.41, observed: 326.2.

Workup

  1. concentrationThen the reaction mixture was concentrated in vacuo
  2. extractionthe residue was extracted with ethyl acetate (2×200 mL)
  3. washwashed with saturated aqueous sodium bicarbonate solution (4×100 mL)
  4. dry with materialdried over anhydrous sodium sulfate
  5. concentrationconcentrated in vacuo
  6. customThe residue was triturated with methanol
  7. customThe resulting precipitate was collected
  8. customdried in vacuo

Sources & evidence

ORD record
ord-0b7eccb6ed034f249200ae35973eba11
Source dataset
uspto-grants-2013_11
Patent number
US08586747B2

Reaction notes

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