反应详情

To a solution of 2-bromo-4,6-dichloro-phenol (14.6 g, 60.3 mmol, Step A compound) in DMF (10 ml) were added K2CO3 (16.53 g, 120.6 mmol) and methanesulfonic acid 2,2-difluoro-ethyl ester (10.7 g, 66.4 mmol, Step B compound) and the mixture was heated to reflux for 16 h. The DMF was then evaporated in vacuo and the resulting residue was dissolved in EtOAc (300 ml). This solution was washed two times with water, with brine, dried with Na2SO4 and evaporated. The remaining crude product was purified by chromatography (silica gel; hexane) and the title compound was obtained as white solid (14.5 g, 79%). MS: m/z=304 [M]+.

1. temperaturethe mixture was heated
2. temperatureto reflux for 16 h
3. customThe DMF was then evaporated in vacuo
4. dissolutionthe resulting residue was dissolved in EtOAc (300 ml)
5. washThis solution was washed two times with water
6. dry with materialwith brine, dried with Na2SO4
7. customevaporated
8. customThe remaining crude product was purified by chromatography (silica gel; hexane)