Ammonium Chloride → (5-Fluoro-2-nitrophenyl)-(6-fluoropyridin-3-yl)amine

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LiHMDS (1.0M in THF, 5.0 mL, 5.0 mmol) was added dropwise to a stirred solution of 6-fluoropyridin-3-ylamine (294 mg, 2.63 mmol) in anhydrous THF (5 mL) under a nitrogen atmosphere at −78° C. After 30 min stirring at −78° C., a solution of 2,4-difluoro-1-nitrobenzene (275 μL, 2.50 mmol) in THF (5 mL) was added and stirring at −78° C. continued for 1 h. The solution was poured into an aqueous solution of NH4Cl and extracted with EtOAc (×3). The combined organic fractions were washed with brine, dried (Na2SO4) and concentrated in vacuo. The resulting residue was purified by column chromatography (Si—PCC, gradient 0-100% DCM in cyclohexane) to afford the title compound as a yellow solid (571 mg, 91%). LCMS (Method C): RT 3.33 min [M+H]+ 252.1.

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