Dimethylformamide → N-(4-chloro-2-fluoro-3-formylphenyl)acetamide

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A −78° C. solution of N-(4-chloro-2-fluorophenyl)acetamide (2.00 g, 10.66 mmol) in THF (40 mL), under Ar, was treated with butyl lithium (16.66 mL, 26.7 mmol), stirred at −78° C. for 2.5 h, treated slowly with DMF (1.651 mL, 21.32 mmol), stirred for 15 min at −78° C. and slowly warmed to RT. The mixture was stirred for 2 h, treated with satd. NH4Cl, the layers separated and the aqueous layer extracted with EtOAc (1×). The combined organics were washed with brine, dried over Na2SO4, concentrated to dryness and purified via silica gel chromatography (EtOAc/Hex) to afford N-(4-chloro-2-fluoro-3-formylphenyl)acetamide (1.1 g, 48% yield) as an off-white solid. MS (ESI) m/z: 216.0 [M+H]+.

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