Tetrahydrofuran → 3-{[tert-Butyl(dimethyl)silyl]oxy}-5-ethyl-2-fluorobenzaldehyde

Temperature

-75 °C

A 250 ml THF solution containing 12.7 g of t-butyl-(5-ethyl-2-fluorophenoxy)dimethylsilane and 7.5 g of N,N,N′N′-tetramethylethylenediamine was cooled to −75° C. under a nitrogen atmosphere, and then 55.6 ml of s-butyllithium (0.99 M, cyclohexane solution) was added and the mixture was stirred for 2 hours. After then adding 7.74 ml of DMF, the mixture was stirred at −75° C. for 1 hour and the temperature was raised to room temperature. Next, 500 ml of diethyl ether and 500 ml of a 5% aqueous ammonium chloride solution were added to the reaction mixture, the organic layer was washed twice with 500 ml of water and once with 500 ml of saturated aqueous sodium chloride in that order, and the aqueous layer was extracted with 100 ml of diethyl ether. The organic layers were combined and dried over anhydrous magnesium sulfate, the desiccant was filtered out, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate-heptane system) to obtain the target compound (12.6 g) as a colorless solid.

1. stirringthe mixture was stirred at −75° C. for 1 hour
2. temperaturethe temperature was raised to room temperature
3. washthe organic layer was washed twice with 500 ml of water and once with 500 ml of saturated aqueous sodium chloride in that order
4. extractionthe aqueous layer was extracted with 100 ml of diethyl ether
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationthe desiccant was filtered out
7. concentrationthe filtrate was concentrated under reduced pressure
8. customThe residue was purified by silica gel column chromatography (ethyl acetate-heptane system)

ORD record

ord-beacbc150e444273ae4caa3521459c0c

Source dataset

uspto-grants-2010_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07807690B2