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Synthesis of 2-Ethoxy-3-fluoro-6-(phenylsulfonyl)pyridin-4-ol (14, To phenylsulfonyl cyanide was dropwise added 3a at -78 °C. The neat reaction mixture was subsequently stirred at 45 °C for 48 h. To the mixture was added a sat. aq solution of NH4Cl (20 mL) and the organic and the aqueous layer were separated. The latter was extracted with CH 2Cl2 (3 × 20 mL, The combined organic layers were dried (Na2SO4, filtered and the filtrate was concentrated in vacuo. The residue was purified by chromatography (silica gel, heptanes-EtOAc) to give 14. Starting with phenylsulfonyl cyanide (0.167 g, 1.0 mmol) and 3a (0.589 g, 2.0 mmol, 14 was isolated as a red solid (0.179 g, 59, 1H NMR (250 MHz, CDCl3, δ, 1.22 (t, 3J, 7.1 Hz, 3 H, OCH2CH3, 4.26 (q, 3J, 7.0 Hz, 2 H, OCH2CH3, 7.19 br s, 1 H, OHhet
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4SNa: 320.03652; found: 320.03633. All products gave satisfactory spectroscopic data and correct elemental analyses and/or high resolution mass data.
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