1,2-Dimethoxyethane → methyl 5-fluoro-2-(1H-pyrazol-5-yl)benzoate

Participants

Reaction Conditions

Reaction Steps

Methyl-2-fluoro-bromobenzoate (1.0 gram, 4.2 mmol) and (1H-pyrazol-5-yl)boronic acid (485 mg, 4.6 mmol) were combined and dissolved in degassed DME (15 mL) then treated with NaHCO3 (706 mg, 8.4 mmol) in water and the reaction purged with bubbling N2 for 5 minutes. The reaction was treated with Pd(PPh3)4 (243 mg (0.2 mmol) and then purged with bubbling for 5 minutes in a sealed vessel and then heated to reflux for 2 h. The reaction mixture was cooled to 23° C., filtered, and the solid was rinsed with EtOAc and the layers separated. The organic layers were combined, dried and concentrated. Chromatography (ethyl acetate/hexanes, 0-30%) gave methyl 5-fluoro-2-(1H-pyrazol-5-yl)benzoate (415 mg, 44%).

Provenance & Evidence