Bromine → N-{3-[(2-amino-1,3-benzothiazol-6-yl)oxy]-4-methoxyphenyl}-3-(1-cyanocyclopropyl)benzamide

Participants

Reaction Steps

To a solution (10 mL) of N-[3-(4-aminophenoxy)-4-methoxyphenyl]-3-(1-cyanocyclopropyl)benzamide (1.74 g, 4.36 mmol) in acetic acid was added potassium thiocyanate (1.46 g, 15.0 mmol), and the mixture was stirred at room temperature for 30 min. To the obtained transparent solution was added dropwise bromine (1.20 g, 7.50 mmol) under ice-cooling, and the reaction mixture was stirred at room temperature for 18 hr. The precipitated yellow powder was filtered off through celite, and the filtrate was concentrated under reduced pressure. To the residue was added 0.1N aqueous sodium hydroxide solution, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent:hexane/ethyl acetate=1:1), and triturated with diethyl ether to give the title compound (1.08 g, 54%) as a yellow solid.

Provenance & Evidence