6-[4-(Trifluoromethyl)phenyl]pyridine-2-carbaldehyde → 1-{6-[4-(Trifluoromethyl)phenyl]-2-pyridinyl}-1-pentanol

Temperatur

0 °C

A solution of 6-[4-(trifluoromethyl)phenyl]-2-pyridinecarbaldehyde (2.50 g, 9.95 mmol) in dry THF (100 mL) was cooled to 0° C. (ice/water bath) and treated with nBuLi (6.8 mL of a 1.6M solution in hexanes, 10.88 mmol) under nitrogen drop-wise over 20 minutes. The resulting deep red coloured solution was stirred at 0° C. for 1.5 hours and then quenched by the addition of aqueous HCl (2M, 10 mL) and allowed to warm to rt over about 20 minutes. The solvents were then removed under vacuum and the residue partitioned between EtOAc (150 mL) and saturated aqueous NaHCO3 (150 mL) and the layers separated. The aqueous was re-extracted with EtOAc (100 mL) and the combined organic layer washed with water (200 mL), brine (200 mL), dried (MgSO4), filtered and reduced to give a pale yellow foam. Purification by Biotage™ chromatography (silica) eluting with cyclohexane:EtOAc (gradient 100:1 to 0:1) afforded the title compound as a pale yellow oil (1.99 g).

1. customquenched by the addition of aqueous HCl (2M, 10 mL)
2. temperatureto warm to rt over about 20 minutes
3. customThe solvents were then removed under vacuum
4. customthe residue partitioned between EtOAc (150 mL) and saturated aqueous NaHCO3 (150 mL)
5. customthe layers separated
6. extractionThe aqueous was re-extracted with EtOAc (100 mL)
7. washthe combined organic layer washed with water (200 mL), brine (200 mL)
8. dry with materialdried (MgSO4)
9. filtrationfiltered
10. customto give a pale yellow foam
11. customPurification by Biotage™ chromatography (silica)
12. washeluting with cyclohexane

ORD-Eintrag

ord-c4647555b2fe4f828e2eb81e421ba446

Quelldatensatz

uspto-grants-2008_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07338960B2