Sodium Carbonate → tert-butyl 4-[2-fluoro-3-(hydroxymethyl)phenyl]-3,6-dihydropyridine-1(2H)-carboxylate

Participants

Reaction Conditions

Reaction Steps

Under argon atmosphere, sodium carbonate (1000 mg) and tetrakis(triphenylphosphine)palladium (170 mg) were added to a mixture of (2-fluoro-3-formylphenyl)boronic acid (700 mg), tert-butyl 4-{[(trifluoromethyl)sulfonyl]oxy}-3,6-dihydropyridine-1(2H)-carboxylate (1000 mg), toluene (15 ml), EtOH (5 ml) and water (5 ml) followed by stirring at 80° C. overnight. The reaction mixture was concentrated under reduced pressure, and CHCl3 and a saturated aqueous sodium hydrogen carbonate solution were then added thereto. The organic layer was dried over Na2SO4 and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/EtOAc). The purified product thus obtained was mixed with EtOH, and NaBH4 (120 mg) was added thereto, followed by stirring at room temperature for 30 minutes. The reaction mixture was concentrated under reduced pressure, and then EtOAc and water were added thereto. The organic layer was dried over Na2SO4 and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/EtOAc) to obtain tert-butyl 4-[2-fluoro-3-(hydroxymethyl)phenyl]-3,6-dihydropyridine-1(2H)-carboxylate (637 mg).

Provenance & Evidence