Dimethyl Sulfide → 4-(5-Fluoro-2-methoxyphenyl)-4-methylpentan-2-one

Temperatur

-78 °C

To a stirred solution of 2-bromo-4-fluoro anisole (3.24 mL, 25 mmol) in anhydrous THF (40 mL) cooled to —78° C. and maintained under argon was added n-butyl lithium (17.2 mL of 1.6 M solution in hexanes, 27.5 mmol). After stirring at −78° C. for 45 minutes, the reaction mixture was treated with a solution of cuprous iodide in dimethyl sulfide (4.76 g in 15 mL, 25 mmol) and stirred for 15 minutes at −78° C. Then chlorotrimethylsilane (6.4 mL, 50 mmol) was added, followed by a solution of mesityl oxide (2.9 mL, 25 mmol) in anhydrous THF (5 mL). The reaction was stirred at −78° C. to −60° C. for 4 hours and then quenched with a saturated solution of ammonium chloride and extracted with three 50 mL portions of methylene chloride. The combined extracts were washed with three 25 mL portions of water, dried over anhydrous sodium sulfate, and concentrated in vacuo to give 4-(5-fluoro-2-methoxyphenyl)-4-methylpentan-2-one as a light brown liquid (85% yield) which was used in the next reaction without further purification.

1. temperaturemaintained under argon
2. stirringstirred for 15 minutes at −78° C
3. stirringThe reaction was stirred at −78° C. to −60° C. for 4 hours
4. customquenched with a saturated solution of ammonium chloride
5. extractionextracted with three 50 mL portions of methylene chloride
6. washThe combined extracts were washed with three 25 mL portions of water
7. dry with materialdried over anhydrous sodium sulfate
8. concentrationconcentrated in vacuo

ORD-Eintrag

ord-b7b7be1902094b79bae7be26846828e1

Quelldatensatz

uspto-grants-2005_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06960581B2