反应详情

To a 0° C. solution of methyl 2″-(hydroxymethyl)-4′-methoxy-2-methyl-4″-(trifluoromethyl)-1,1′:3′,1″-terphenyl-4-carboxylate (1.500 g, 3.49 mmol) in CH2Cl2 (14 mL) was added CBr4 (2.429 g, 7.33 mmol), and then a solution of triphenyl phosphine (1.830 g, 6.98 mmol) in CH2Cl2 (15 mL). The solution was warmed to room temperature and stirred for twelve hours. The reaction was concentrated, and the residue was purified by flash chromatography on silica gel (0 to 25% EtOAc/hexanes) to afford methyl 2″-(bromomethyl)-4′-methoxy-2-methyl-4″-(trifluoromethyl)-1,1′:3′,1″-terphenyl-4-carboxylate. Rf=0.59 (50% EtOAc/hexanes). LCMS=494.8 (M+1)+. 1H NMR (CDCl3, 500 MHz), δ 7.95 (s, 1H), 7.89 (d, J=8.0 Hz, 1H), 7.80 (s, 1H), 7.59 (d, J=7.6 Hz, 1H), 7.40-7.33 (m, 3H), 7.21 (d, J=2.3 Hz, 1H), 7.06 (d, J=8.5 Hz, 1H), 4.44-4.39 (m, 2H), 3.93 (s, 3H), 3.82 (s, 3H), 2.37 (s, 3H).

1. concentrationThe reaction was concentrated
2. customthe residue was purified by flash chromatography on silica gel (0 to 25% EtOAc/hexanes)