3-Chloro-1-propanol → 3-(3,5-Difluorophenoxy)propan-1-ol

2.77 g (69.18 mmol) of sodium hydride (60% in mineral oil) were dissolved in 80 ml of DMF. At 0° C., 7.50 g (57.65 mmol) of 3,5-difluorophenol in 15 ml of DMF were added dropwise and, after the gas evolution subsided, the mixture was stirred at RT for 30 min. The solution was cooled to 0° C., 5.45 g (57.65 mmol) of 3-chloro-1-propanol in 15 ml of DMF were added, and the mixture was then stirred at 60° C. for 2 h and at 75° C. for 16 h. The precipitated salts were filtered off, and DMF was removed in a rotary evaporator. The residue was taken up in water and extracted twice with diethyl ether. The combined organic phases were washed successively with water, 1N aqueous sodium hydroxide solution and saturated aqueous sodium chloride solution, dried over sodium sulfate and filtered, and the solvents were removed in vacuo. The crude product was purified by column chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate gradient) to result in 8.15 g (75% of theory) of the title compound.

1. temperatureThe solution was cooled to 0° C.
2. stirringthe mixture was then stirred at 60° C. for 2 h and at 75° C. for 16 h
3. filtrationThe precipitated salts were filtered off
4. customDMF was removed in a rotary evaporator
5. extractionextracted twice with diethyl ether
6. washThe combined organic phases were washed successively with water, 1N aqueous sodium hydroxide solution and saturated aqueous sodium chloride solution
7. dry with materialdried over sodium sulfate
8. filtrationfiltered
9. customthe solvents were removed in vacuo
10. customThe crude product was purified by column chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate gradient)

ORD record

ord-d2a6dfbe71ab4c5f8cd821cd10b6982f

Source dataset

uspto-grants-2011_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08063234B2