Pyridine → 4-Bromo-1-{3-fluoro-4-[(phenylmethyl)oxy]phenyl}-1H-indazole

Participants

Reaction Steps

To a solution of 4-bromo-1H-indazole (4.32 g, 21.9 mmol) in dichloromethane (100 mL) was added 4-benzyloxy-3-fluorobenzeneboronic acid (10.8 g, 43.9 mmol), pyridine (3.5 mL, 43.3 mmol), copper acetate (5.9 g, 32.6 mmol) and powdered 4A molecular sieves (5 g). The reaction mixture was stirred at room temperature in the presence of air for 5 days. Celite was added to the reaction mixture and the mixture stirred for 5 minutes. The mixture was then filtered through a pad of celite and washed with dichloromethane and then the filtrate concentrated in vacuo. The residue was diluted in dichloromethane and water. After separation of the layers, the aqueous phase was extracted with dichloromethane (×4). The combined organic layers were dried over magnesium sulphate, filtered and concentrated in vacuo. The product was purified by silica gel chromatography eluting with 10-80% dichloromethane in hexane to yield the title compound (D38) (5.25 g).

Provenance & Evidence