Triethylsilane → 2-(3-Bromo-phenyl)-6-fluoro-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-5-carboxylic acid methyl ester

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Reaction Conditions

Reaction Steps

To a stirred mixture solution of 2-(3-bromo-phenyl)-6-fluoro-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-5-carboxylic acid methyl ester (63.0 g, 154 mmol) and triethylsilane (60 mL) at 25° C. was added trifluoroacetic acid (30 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-bromo-phenyl)-6-fluoro-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-5-carboxylic acid methyl ester (30.2 g, 50%) as a yellow oil: LC/MS m/e calcd for C19H19BrFNO2 (M+H)+: 393.27, observed: 392.0 & 394.0.

Provenance & Evidence