反应详情

A solution of triphenylphosphine (102.8 mg, 0.392 mmol) in dry CH2Cl2 (2 mL) was added by cannula to a stirred solution of carbon tetrabromide (130 mg, 0.392 mmol) and 4-fluoro-2′-(hydroxymethyl)-5-isopropyl-2-methoxy-4′-(trifluoromethyl)biphenyl-3-ol (58.5 mg, 0.163 mmol) in dry CH2Cl2 (2 mL) at 0° C. under N2 and the reaction was stirred at room temperature overnight. The reaction mixture was concentrated in vacuo to give the crude product. This was purified by flash chromatography (Si, 12×160 mm, 0-40% EtOAc in hexanes gradient) to afford 2′-(bromomethyl)-4-fluoro-5-isopropyl-2-methoxy-4′-(trifluoromethyl)biphenyl-3-ol. Rf=0.55 (20% EtOAc in hexanes). 1H NMR (600 MHz, CDCl3) δ 7.84 (s, 1H), 7.61 (d, J=7.9 Hz, 1H), 7.42 (d, J=8.0 Hz, 1H), 6.69 (d, J=7.8 Hz, 1H), 5.59 (s, 1H), 4.50 (d, J=9.6 Hz, 1H), 4.39 (d, J=9.7 Hz, 1H), 3.47 (s, 3H), 3.29-3.23 (m, 1H), 1.27 (d, J=6.9 Hz, 6H).

1. concentrationThe reaction mixture was concentrated in vacuo
2. customto give the crude product
3. customThis was purified by flash chromatography (Si, 12×160 mm, 0-40% EtOAc in hexanes gradient)