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Trifluoromethanesulphonic anhydride (570 mg, 2.0 mmol) was added drop wise to a solution of (5-hydroxy-4′-trifluoromethyl-biphenyl-3-yl)-acetic acid ethyl ester (546 mg, 1.69 mmol) and pyridine (0.41 mL, 5.0 mmol) in DCM (10 mL) at 0° C. The temperature was maintained at 0° C. for 15 mins before warming to room temperature and the mixture stirred for 18 hrs. The reaction was diluted with DCM, washed with H2O, Na2CO3, dil. HCl, brine, dried (MgSO4) and evaporated under reduced pressure to give a yellow oil. The residue was purified by flash column chromatography (EtOAc:petroleum ether), yield 695 mg (96%). 1H NMR (CDCl3) δ 7.72 (d, 2H), 7.66 (d, 2H), 7.54 (t, 1H), 7.39 (t, 1H), 7.28 (t, 1H), 4.19 (q, 2H), 3.73 (s, 2H), 1.28 (t, 3H).

1. temperaturebefore warming to room temperature
2. washwashed with H2O, Na2CO3, dil. HCl, brine
3. dry with materialdried (MgSO4)
4. customevaporated under reduced pressure
5. customto give a yellow oil
6. customThe residue was purified by flash column chromatography (EtOAc:petroleum ether), yield 695 mg (96%)