Hydrochloric Acid → Selumetinib

Participants

Reaction Steps

Hydrochloric acid (14 mL, 1.0 M aqueous solution, 14 mmol) is added to a suspension of 6-(4-bromo-2-chloro-phenylamino)-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid (2-vinyloxy-ethoxy)-amide 29a (2.18 g, 4.50 mmol) in ethanol (50 mL) and the reaction mixture allowed to stir for 24 hours. The reaction mixture is concentrated to dryness by rotary evaporation and the solids partitioned between 3:1 ethyl acetate/tetrahydrofuran and saturated potassium carbonate. The aqueous phase is extracted with 3:1 ethyl acetate/tetrahydrofuran (3×), the combined organics dried (Na2SO4), and concentrated to provide 2.11 g (100%) 6-(4-bromo-2-chloro-phenylamino)-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid (2-hydroxy-ethoxy)-amide as an off-white solid. MS ESI (+)m/z 457, 459 (M+, Br pattern) detected. 1H NMR (500 MHz, MeOH-d4) δ 8.26 (s, 1H), 7.78 (s, 1H), 7.57 (d, 1H), 7.24 (dd, 1H), 6.40 (dd, 1H), 3.86 (s, 3H), 3.79 (m, 2H), 3.49 (m, 2H). 19F NMR (376 MHz, MeOH-d4)−133.68 (s).

Provenance & Evidence