1-bromo-2-fluoro-3-methylbenzene

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 1-bromo-2-fluoro-3-methylbenzene (7.0 g, 37.0 mmol) in THF (60 mL) was brought to −78° C. followed by the dropwise addition of butyllithium (15.55 ml, 38.9 mmol). The resulting mixture was stirred at −78° C. for 1 h then neat ethyl 2-fluoroacetate (3.76 ml, 38.9 mmol) was added dropwise. After 30 min the reaction went to completion. The reaction was quenched at −78° C. with saturated NH4Cl, warmed to rt and transferred to a separatory funnel. The aqueous phase was extracted with EtOAc and the combined organic extracts were washed with brine, dried over Na2SO4, filtered, concentrated and chromatographed on silica gel using 0-10% EtOAc/hexanes to afford a colorless oil that turned into a white solid as 2-fluoro-1-(2-fluoro-3-methylphenyl)ethanone (5.03 g, 29.6 mmol, 80% yield). MS m/z=171 [M+H]+. Calculated for C9H8F2O: 170.05. was brought to −78° C. After 30 min the reaction went to completion The reaction was quenched at −78° C. with saturated NH4Cl warmed to rt transferred to a separatory funnel The aqueous phase was extracted with EtOAc the combined organic extracts were washed with brine dried over Na2SO4 filtered concentrated chromatographed on silica gel using 0-10% EtOAc/hexanes to afford a colorless oil that

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 1-bromo-2-fluoro-3-methylbenzene (7.0 g, 37.0 mmol) in THF (60 mL) was brought to −78° C. followed by the dropwise addition of butyllithium (15.55 ml, 38.9 mmol). The resulting mixture was stirred at −78° C. for 1 h then neat ethyl 2-fluoroacetate (3.76 ml, 38.9 mmol) was added dropwise. After 30 min the reaction went to completion. The reaction was quenched at −78° C. with saturated NH4Cl, warmed to rt and transferred to a separatory funnel. The aqueous phase was extracted with EtOAc and the combined organic extracts were washed with brine, dried over Na2SO4, filtered, concentrated and chromatographed on silica gel using 0-10% EtOAc/hexanes to afford a colorless oil that turned into a white solid as 2-fluoro-1-(2-fluoro-3-methylphenyl)ethanone (5.03 g, 29.6 mmol, 80% yield). MS m/z=171 [M+H]+. Calculated for C9H8F2O: 170.05. was brought to −78° C. After 30 min the reaction went to completion The reaction was quenched at −78° C. with saturated NH4Cl warmed to rt transferred to a separatory funnel The aqueous phase was extracted with EtOAc the combined organic extracts were washed with brine dried over Na2SO4 filtered concentrated chromatographed on silica gel using 0-10% EtOAc/hexanes to afford a colorless oil that