Ethyl Bromide → 5-(4-(Difluoromethoxy)-2-ethoxy-3-methoxyphenyl)isoindolin-1-one

Participants

Reaction Conditions

Reaction Steps

To a stirring solution of 6-bromo-3-(difluoromethoxy)-2-methoxyphenol (200 mg, 0.74 mmol) in acetonitrile (10 mL) was added potassium carbonate (307 mg, 2.23 mmol) and ethyl bromide (0.6 mL, 2.23 mmol) and the resultant reaction mixture was heated to 80° C. for 2 h. The reaction mixture was cooled to RT, filtered through celite and the filtrate was concentrated under reduced pressure to afford 200 mg of crude product, 1-Bromo-4-difluoromethoxy-2-ethoxy-3-methoxy-benzene, as a solid. A stirring solution of 1-bromo-4-(difluoromethoxy)-2-ethoxy-3-methoxybenzene (200 mg, 0.673 mmol) in N,N-dimethylformamide (5 mL) was purged with argon for 1 h, to this cesium carbonate (656 mg, 2.019 mmol), tetrakis(triphenylphosphine) palladium(0) (38 mg, 0.033 mmol) and 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isoindolin-1-one (209 mg, 0.807 mmol) were added and the resultant reaction mixture was heated to 80-90° C. for 3 h. The reaction mixture was cooled to RT, filtered and the filtrate was diluted with water and extracted with ethyl acetate (3×). The combined ethyl acetate layer was washed with brine and dried over anhydrous sodium sulphate and concentrated under reduced pressure. Purification of the residue by column chromatography (silica gel, 0-20% ethyl acetate in pet ether) afforded the title compound as a solid (30 mg, 13%).

Provenance & Evidence