Dimethylformamide → 2-Fluoro-3-(2-hydroxyethyl)benzaldehyde

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

2,2,6,6-Tetramethylpiperidine (10.8 mL) was added to a solution of butyllithium (1.6M in hexanes, 40.1 mL) in THF (40 mL) at −70° C. A solution of 2-(2-fluorophenyl)ethanol (3 g) in THF (40 mL) was added dropwise and the resulting mixture stirred for 6 h at −70° C. DMF (8.29 mL) was then added and the mixture stirred for 1 h at −70° C. The mixture was then allowed to warm to RT and stirred for 70 h. The reaction was quenched with HCl solution (2M, 50 mL), diluted with ethyl acetate (100 mL) and the layers separated. The aqueous phase was extracted with ethyl acetate (2×100 mL). The combined organic solutions were washed with HCl solution (2M, 50 mL), brine (20 mL), dried over magnesium sulphate, filtered and evaporated. The residue was purified by silica gel chromatography eluting with 4:1 to 2:1 isohexane:ethyl acetate gradient. The fractions containing product were combined and evaporated to give the subtitled compound as a yellow oil. Yield 1.2 g.

Herkunft & Nachweise