Bromine → HCID 86657978, compound

Participants

Reaction Steps

To a solution of potassium thiocyanate (62.9 g, 647 mmol) in acetic acid (500 ml) was added benzyl {3-[(5-aminopyridin-2-yl)oxy]-4-methylphenyl}carbamate (56.5 g, 162 mmol), and a solution of bromine (27.1 g, 170 mmol) in acetic acid (100 mL) was added dropwise. The reaction mixture was stirred at room temperature for 18 hr, and the insoluble material was filtered off through a celite pad. The filtrate was concentrated under reduced pressure, and the obtained residue was diluted with ethyl acetate (500 mL) and washed with saturated aqueous sodium hydrogen carbonate solution (300 mL). The obtained aqueous layer was extracted with ethyl acetate (100 mL). The combined organic layer was washed with saturated brine (100 mL), and purified by silica gel (ethyl acetate). The obtained solution was concentrated under reduced pressure, and the crystals precipitated during concentration were collected by filtration to give the title compound (48.4 g, 74%) as a pale-brown solid.

Provenance & Evidence