Potassium Hydroxide → (2R)-4-(5-Fluoro-4-iodo-2-oxopyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanoic acid

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Potassium hydroxide (669 mg, 7.7 mmol) was added to a solution of ethyl (2R)-4-(5-fluoro-4-iodo-2-oxopyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanoate (691 mg, 1.55 mmol) in 2-methyltetrahydrofuran:water (2:1 22.5 mL) and the solution was stirred at 70° C. for 2 h. The reaction was diluted with 1 N aq NaOH (50 mL). The organics were separated and the aqueous layer was washed with EtOAc (2×50 mL), and acidified to a pH of 3 using 3 M aqueous HCl. The aqueous layer was extracted with EtOAc (3×60 mL), dried (MgSO4), filtered and concentrated to afford a yellow-white solid (290 mg, 44.8%). MS (LCMS) m/z 418.0. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.53 (s, 3 H) 2.08-2.20 (m, 1 H) 2.36-2.48 (m, 1 H) 3.13 (s, 3 H) 3.79-4.02 (m, 2 H) 7.03 (d, J=6.05 Hz, 1 H) 7.96 (d, J=4.29 Hz, 1 H) 13.82 (br. s., 1 H).

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