Triethylsilane → 2-(3-Bromo-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester

HRID 2045346Notes

Reaction equation

HRID 2045346 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[CH:7]=[C:8]2[C:13](=[CH:14][CH:15]=1)[NH:12][CH:11]([C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([Br:22])[CH:17]=1)[C:10]([CH3:24])([CH3:23])[CH:9]2O)=[O:5])[CH3:2].C([SiH](CC)CC)C>FC(F)(F)C(O)=O>[CH2:1]([O:3][C:4]([C:6]1[CH:7]=[C:8]2[C:13](=[CH:14][CH:15]=1)[NH:12][CH:11]([C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([Br:22])[CH:17]=1)[C:10]([CH3:23])([CH3:24])[CH2:9]2)=[O:5])[CH3:2]

Participants

4

Reactant 2

HCID 12052TriethylsilaneHCID 674413532-(3-Bromo-phenyl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester

Product 1

HCID 674428312-(3-Bromo-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl esterYield 37.2%

Reagents, catalysts & solvents 1

HCID 6422Trifluoroacetic acidSolvent

Conditions

Temperature
25 °C

Procedure

To a mixture of 2-(3-bromo-phenyl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (8.12 g, 20.1 mmol) and triethylsilane (10 mL) at 25° C. was added trifluoroacetic acid (10 mL) dropwise. The resulting mixture was stirred at 25° C. for 1 h. 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 (2×100 mL), dried over anhydrous sodium sulfate and concentrated in vacuo. Purification on flash silica gel chromatography (silica gel from QingDao, 200-300 mesh, glass column from Shanghai SD company)(10% ethyl acetate/hexanes) to afford 2-(3-bromo-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (2.9 g, 37%) as a white solid: LC/MS m/e calcd for C20H22BrNO2 M+: 388.3, observed: 388.0, 390.0.

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 (2×100 mL)
  4. dry with materialdried over anhydrous sodium sulfate
  5. concentrationconcentrated in vacuo
  6. customPurification on flash silica gel chromatography (silica gel from QingDao, 200-300 mesh, glass column from Shanghai SD company)(10% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-9aac79f8cf9f404f8915ba3d125063d3
Source dataset
uspto-grants-2013_11
Patent number
US08586747B2

Reaction notes

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