Carbon tetrabromide → 2-(Bromomethyl)-5'-isopropyl-2'-methoxy-4-(trifluoromethyl)biphenyl

Beteiligte Stoffe

Reaktionsschritte

CBr4 (112 mg, 0.211 mmol) and Ph3P (55 mg, 0.211 mmol) were added successively to a stirred solution of [5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methanol (57.1 mg, 0.176 mmol) in dry CH2Cl2 (1 mL) at 0° C. under N2. The solution was stirred at room temperature for 1 h and the reaction mixture was concentrated in vacuo to afford the crude product. This was purified by flash chromatography (Si, 12×160 mm, 0-20% EtOAc in hexanes gradient) to give 2-(bromomethyl)-5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl as a colorless oil. Rf=0.95 (20% EtOAc/hexanes). LCMS calc.=387.05; found=387.0 (M+1)+. 1H NMR (CDCl3, 500 MHz) δ 7.83 (br s, 1H), 7.60 (dd, J=8.0, 1.3 Hz, 1H), 7.37 (d, J=8.0 Hz, 1H), 7.29 (dd, J=8.5, 2.3 Hz, 1H), 7.14 (d, J=2.3 Hz, 1H), 6.95 (d, J=8.5, 1H), 4.45 (d, J=10.6 Hz, 1H), 4.33 (d, J=10.6 Hz, 1H), 3.76 (s, 3H), 2.94 (septet, J=6.9 Hz, 1H), 1.29 (d, J=6.9 Hz, 6H).

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