4-Fluoro-3-methoxybenzaldehyde → (4-Fluoro-3-methoxyphenyl)(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)methanol

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To a solution of 1-bromo-3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)benzene, prepared as described in Procedure N, (1.00 g, 3.44 mmol) in diethyl ether in (10 mL) at −72° C. was added 2.5 M n-BuLi (1.37 mL, 3.44 mmol) dropwise. Upon completion of addition, the reaction mixture was stirred for 15 minutes at −72° C., then 4-fluoro-3-methoxybenzaldehyde (0.53 g, 3.44 mmol) was added while the reaction mixture temperature was maintained below −52° C. The reaction mixture was stirred for 3 h at −72° C. The reaction mixture was quenched by the addition of 1N HCl and the aqueous portion was extracted with EtOAc (2×). The combined organic layers were washed with sat. NaCl, dried over MgSO4 and concentrated under reduced pressure. The residue was purified by ISCO using a gradient of 0-50% EtOAc/hexane as eluent to yield (4-fluoro-3-methoxyphenyl)(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)methanol (0.83 g, 66% yield). HPLC: RT=3.85 min (Phenomenex Luna C18 5μ column, eluting with 10-90% aqueous methanol containing 0.1% phosphoric acid over a 4 minute gradient, flow rate 4 mL/min, monitoring at 220 nm); 1H NMR (CDCl3): 7.05-6.8 (m, 6H), 5.87 (tt, J=2.8, 52.9 Hz), 5.75 (s, 1H), 3.85 (s, 3H).

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