Hydrochloric Acid → 2-Ethyl-2-(methylsulfonyl)-4-(2-oxo-4-phenylpyridin-1(2H)-yl)butanoic acid

関与物質

反応手順

Potassium hydroxide (37 mg, 0.66 mmol, 6.0 equiv) was added to a solution of ethyl 2-ethyl-2-(methylsulfonyl)-4-(2-oxo-4-phenylpyridin-1(2H)-yl)butanoate (43 mg, 0.11 mmol, 1.0 equiv) in 2:2:1 tetrahydrofuran-methanol-water (2.5 mL) at 0° C. The reaction was allowed to warm to room temperature and stir overnight. The reaction was concentrated under reduced pressure to provide a wet residue that was diluted with water (5 mL) and acidified (to pH=2) with 1.0 hydrochloric acid. The resulting white precipitate was filtered, washed with water, and dried under reduced pressure to provide the title compound (34 mg, 85%). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.09 (t, J=7.52 Hz, 3 H) 1.42 (s, 3 H) 1.93-2.07 (m, 1 H) 2.23-2.37 (m, 2 H) 2.55 (d, J=5.66 Hz, 1 H) 3.25 (s, 3 H) 4.10-4.24 (m, 2 H) 4.47-4.59 (m, 2 H) 6.63-6.67 (m, 1 H) 6.90 (d, J=1.95 Hz, 1 H) 7.44-7.50 (m, 4 H) 7.54-7.62 (m, 2 H).

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