反应详情

温度

30 °C

To a 0° C. solution of 4-bromophenol (1.87 g, 1.08 mmol), ethyl 4-(1-hydroxybutyl)benzoate (2 g, 0.9 mmol) and triphenylphosphine (2.83 g, 1.08 mmol) in THF (20 mL) was added DIAD (2.18 g, 1.08 mmol). The resulting mixture was stirred at 30° C. overnight. The reaction mixture was diluted with brine (20 mL) and extracted with ethyl acetate (3*25 mL). The combined organic layers were dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel chromatography to give (+/−)-ethyl 4-(1-(4-bromophenoxy)butyl)benzoate (2.3 g, 67.7%) as a yellow oil. 1HNMR (400 MHz, CDCl3) δ 8.00 (d, J=8.4 Hz, 2H), 7.37 (d, J=8.4 Hz, 2H), 7.25 (d, J=8.8 Hz, 2H), 6.67 (d, J=8.8 Hz, 2H), 5.08 (m, 1H), 4.35 (q, J=7.2 Hz, 2H), 1.98-1.94 (m, 1H), 1.80-1.74 (m, 1H), 1.52-1.50 (m, 1H), 1.43-1.39 (m, 1H), 1.37 (t, J=7.2 Hz, 3H), 0.94 (t, J=7.2 Hz, 3H).

1. extractionextracted with ethyl acetate (3*25 mL)
2. dry with materialThe combined organic layers were dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel chromatography