N-bromobutanimide → 3-{[3-(Bromomethyl)-2,6-difluorophenyl]oxy}-5-chlorobenzonitrile

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Reaction Conditions

Reaction Steps

A solution of 3-chloro-5-[(2,6-difluoro-3-methylphenyl)oxy]benzonitrile (4.05 g, 14.48 mmol) and NBS (3.09 g, 17.38 mmol) in carbon tetrachloride (500 mL) was degassed and heated to 90° C. under a nitrogen atmosphere. After ca. 5 min, AIBN (0.119 g, 0.724 mmol) was added and the solution was heated for 6 h. The solution was cooled to 0° C. then filtered through Celite. The filtrate was concentrated and the crude material was purified on silica gel (hexanes/ethyl acetate) to give the title compound (2.9 g, 56%) as a white solid. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 7.31-7.40 (m, 2H), 7.21 (t, 1H), 7.04-7.11 (m, 2H), 4.51 (s, 2H).

Provenance & Evidence