Ethyl isobutyrate → HCID 90415236, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of diisopropylamine (8.00 mL, 57.1 mmol) in THF (300 mL) cooled to 0° C. was added n-BuLi (24.60 mL, 61.5 mmol) dropwise. The mixture was stirred at 0° C. for 1 h. Then to the mixture cooled to −30° C. was added a solution of ethyl isobutyrate (6.12 g, 52.7 mmol) in THF (2 mL). The mixture was stirred at −30° C. for 1 h. To the mixture was added a solution of 1-(bromomethyl)-2-(trifluoromethyl)benzene (10.5 g, 43.9 mmol) in THF (5 mL) at −30° C. The whole mixture was stirred at −30° C. for 3 h and then stirred at 25° C. for 12 h. The mixture was quenched with NH4Cl (aq) and extracted with EA. The organic layer was washed with brine, dried over MgSO4, filtered and concentrated. The crude material was purified on silica column chromatography (PE/EA=200:1). All fractions found to contain product by TLC (PE/EA=10:1, Rf=0.6) were combined and concentrated to yield a light yellow solid of ethyl 2,2-dimethyl-3-(2-(trifluoromethyl)phenyl)propanoate (10 g, 35.3 mmol, 80.0% yield): 1H NMR (400 MHz, CDCl3) δ: 7.62 (d, J=8.0 Hz, 1H), 7.41 (t, J=7.6 Hz, 1H), 7.29 (t, J=7.6 Hz, 1H), 7.22 (d, J=8.0 Hz, 1H), 4.17 (q, J=7.2 Hz, 2H), 3.14 (s, 3H), 1.25 (t, J=7.2 Hz, 3H), 1.18 (s, 6H); ES-LCMS m/z 275 (M+H).

Provenance & Evidence