반응 #60261

반응 방정식

Hydrochloric acid

6-(4-bromo-2-chloro-phenylamino)-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid (2-vinyloxy-ethoxy)-amide

6-(4-Bromo-2-chloro-phenylamino)-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid (2-vinyloxy-ethoxy)-amide

→

6-(4-bromo-2chloro-phenylamino)-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid (2-hydroxy-ethoxy)-amide

수율 102.4%

용매

ethanol

반응 조건

후처리

1. 1
   농축The reaction mixture is concentrated to dryness by rotary evaporation
2. 2
   기타the solids partitioned between 3:1 ethyl acetate/tetrahydrofuran and saturated potassium carbonate
3. 3
   추출The aqueous phase is extracted with 3:1 ethyl acetate/tetrahydrofuran (3×)
4. 4
   건조the combined organics dried (Na2SO4)
5. 5
   농축concentrated

실험 절차

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-2chloro-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 (400 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).

출처