(Trifluoromethyl)trimethylsilane → 1-(3-Bromo-4-methylpyridin-2-yl)-2,2,2-trifluoroethanol

Temperatur

-15 °C

Tetrabutylammonium fluoride (1.0 mol/L) in THF (1.2 mL, 1.20 mmol) was added dropwise to a solution of 3-bromo-4-methyl-pyridine-2-carbaldehyde (150 mg, 0.75 mmol), and (trifluoromethyl)trimethylsilane (2.0 mol/L) in THF (0.49 mL, 0.975 mmol) in THF (10 mL) cooled at −15° C. The reaction mixture was warmed to room temperature and stirred overnight. The reaction mixture was diluted with ethyl acetate (50 mL) and washed with water (25 mL). The organic layer was separated, dried over sodium sulfate, filtered and concentrated in vacuo to provide a residue that was purified by flash chromatography (12 g, Silica, 0-30% ethyl acetate in heptane). Desired fractions were combined and evaporated in vacuo to afford the title compound as a white solid (90 mg, 44%), which was used in the next step without further purification.

1. temperatureThe reaction mixture was warmed to room temperature
2. washwashed with water (25 mL)
3. customThe organic layer was separated
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customto provide a residue that
8. customwas purified by flash chromatography (12 g, Silica, 0-30% ethyl acetate in heptane)
9. customevaporated in vacuo

ORD-Eintrag

ord-e5d87640cd3847d596efda7ad893f140

Quelldatensatz

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09206175B2