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0 °C

A solution of 1-{5-chloro-4-fluoro-2-hydroxy-3-[5-(methylsulfonyl)pyridin-3-yl]phenyl}ethanone (1.3 g, 3.6 mmol) in THF (32 mL) was treated with ethanol (0.28 mL, 4.73 mmol) and triphenylphosphine (1.3 g, 5.1 mmol). The reaction mixture was cooled to 0° C., treated with diisopropyl azodicarboxylate (1.1 mL, 5.5 mmol) dropwise, and stirred at 20° C. for 1 hour. The reaction mixture was concentrated to remove most of the THF, diluted with EtOAc, washed with saturated sodium bicarbonate, water, brine, dried over sodium sulfate, filtered and concentrated to a crude residue which was purified by flash column chromatography using EtOAc in hexanes (15%-65%) to give the desired product (1.2 g, 87%). LCMS for C16H16ClFNO4S (M+H)+: m/z=372.0. Found: 372.1.

1. concentrationThe reaction mixture was concentrated
2. customto remove most of the THF
3. additiondiluted with EtOAc
4. washwashed with saturated sodium bicarbonate, water, brine
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated to a crude residue which
8. customwas purified by flash column chromatography