Triethylamine → 2-(4-(Methylsulfonyl)phenyl)-2-oxoethyl 2-(4-fluorophenyl)acetate

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To a stirred solution of 4.45 g (28.9 mmol) of 4-fluorophenylacetic acid in 3.26 g (31.8 mmol) of triethylamine and 275 mL of acetonitrile was added 8.9 g (28.9 mmol) of 2-bromo-4'-(methylsulfonyl)acetophenone (prepared in Step 3) at ambient temperature. The reaction mixture was stirred for 30 minutes, concentrated in vacuo, and partitioned between ethyl acetate and water. The organic phase was dried (MgSO4) and concentrated in vacuo. Purification by silica gel chromatography with ethyl acetate/hexane (1:1) gave 6.87 g (68%) of 2-(4-fluorophenyl)-1-[2-[4-(methylsulfonyl) phenyl]-2-oxoethoxy]ethanone as a colorless solid: NMR (CDCl3) δ 3.08 (s, 3H), 3.79 (s, 2H), 5.35 (s, 2H), 7.06 (s, t, J=9 Hz, 2H), 7.32 (dd, J=6and 9 Hz, 2H), 8.06 (s, 4H).

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