Formaldehyde → (6-Bromo-2-fluoropyridin-3-YL)methanol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To Diisopropylamine (22.001 mmol; 2240 mg; 3.13 mL) in THF (40 mL) at 0° C. was added N-Butyllithium (2.5 mol/L) in Hexane (24.001 mmol; 9.6 mL). The reaction was stirred at 0° C. for 0.5 h, and then cooled to −78° C. 2-bromo-6-fluoro-pyridine (20.001 mmol; 3520.0 mg) in THF (10 mL) was added dropwise. The mixture was stirred at −78° C. for 2.5 h. Paraformaldehyde (40.002 mmol; 3603.3 mg) was added rapidly. The mixture was allowed to warm to room temperature and stirred overnight. The reaction was quenched with water. The layers were separated. The aqueous layer was extracted with EtOAc. The combined organic layers were concentrated and the residue was purified on silica eluted with 0 to 50% EtOAc in Heptane to afford (6-bromo-2-fluoro-3-pyridyl)methanol (1.4888 g, 36%).

Herkunft & Nachweise