反应详情

9.8 g of 2-(2-bromophenyl)ethanol and 4.7 cm3 of pyridine are dissolved under an inert atmosphere in 200 cm3 of dichloromethane at a temperature close to 20° C. The reaction mixture is cooled to a temperature close to 0° C. and 4.55 cm3 of methanesulfonyl chloride are introduced dropwise. The stirring is continued for 72 h, during which time the medium is allowed to gradually climb back up to a temperature close to 20° C. 100 cm3 of a saturated aqueous solution of sodium hydrogen carbonate are added to the reaction mixture. Stirring is continued for 10 min. The aqueous phase is extracted with dichloromethane. The organic phases are combined, washed with a saturated aqueous solution of sodium chloride, dried over magnesium sulfate, filtered then concentrated using a rotary evaporator under reduced pressure (5 kPa). The 18 g of brown oil obtained are purified by flash chromatography over silica (column: 200 g; particle size: 15-40 μm; eluent: 100% dichloromethane to 90% dichloromethane/10% ethyl acetate gradient). After concentrating the fractions under reduced pressure, 12.9 g of 2-(2-bromophenyl)ethyl methanesulfonate are obtained in the form of a colorless oil.

1. customclose to 20° C
2. temperatureThe reaction mixture is cooled to a temperature
3. customclose to 0° C.
4. customclose to 20° C
5. waitis continued for 10 min
6. extractionThe aqueous phase is extracted with dichloromethane
7. washwashed with a saturated aqueous solution of sodium chloride
8. dry with materialdried over magnesium sulfate
9. filtrationfiltered
10. concentrationthen concentrated
11. customa rotary evaporator under reduced pressure (5 kPa)