反应详情

温度

-10 °C

To a 25 mL round bottomed flask equipped with a magnetic stirrer was added triphenylphosphine (1.57 g, 6 mmol) and methylene chloride (8 mL). Upon cooling the mixture to −10° C., bromine (0.28 mL, 5.5 mmol) was added dropwise. After 10 min, 2-chloro-4-fluoro-3-(2-hydroxyethyl)benzonitrile (1 g, 5 mmol) in methylene chloride (6 mL) was added and stirring was continued for 20 min while the internal reaction temperature was allowed to warm to 15° C. The mixture was then diluted with hexane (30 mL) and purified via a silica plug [hexane-Et2O (20:1) as eluent]. The combined filtrates were concentrated to furnish the title compound (1.26 g, 96%): 1H NMR (400 MHz, Acetone-d6, δ in ppm) 7.92 (dd, J=6 and 9 Hz, 1H), 7.42 (t, J=9 Hz, 1H), 3.70 (t, J=7 Hz, 2H), 3.13 (dt, J=2 and 7 Hz, 2H).

1. customTo a 25 mL round bottomed flask equipped with a magnetic stirrer
2. waitwas continued for 20 min while the internal reaction temperature
3. temperatureto warm to 15° C
4. custompurified via a silica plug [hexane-Et2O (20:1) as eluent]
5. concentrationThe combined filtrates were concentrated