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A solution of sodium nitrite (0.37 g, 5.36 mmol) in water (1.5 mL) was added dropwise to a cooled (0 C.) suspension of 4-amino-2-(trifluoromethyl)benzoic acid (1 g, 4.9 mmol) in hydrochloric acid (37%, 2 mL) and ice (3 g). After 20 min at 0 C. the reaction mixture was slowly added to a stirred solution of potassium iodide (8.09 g, 48.8 mmol) in water (8 mL) at 0 C. The resulting mixture was stirred at room temperature over night, dichloromethane and sodium sulfite (2.52 g, 20.0 mmol) was added, the organic phase was collected, dried over magnesium sulfate and the solvent was evaporated to give the title compound.1H NMR (DMSO-d6) delta ppm 13.78 (s, 1H) 8.11-8.24 (m, 2H) 7.49-7.66 (m, 1H); MS (ESI) m/z 315 [M-1]-.
A solution of sodium nitrite (0.37 g, 5.36 mmol) in water (1.5 mL) was added dropwise to a cooled (0 0C) suspension of 4-amino-2-(trifluoromethyl)benzoic acid (1 g, 4.9 mmol) in hydrochloric acid (37%, 2 mL) and ice (3 g). After 20 min at 0 0C the reaction mixture was slowly added to a stirred solution of potassium iodide (8.09 g, 48.8 mmol) in water (8 mL) at 0 0C. The resulting mixture was stirred at room temperature over night, dichloromethane and sodium sulfite (2.52 g, 20.0 mmol) was added, the organic phase was collected, dried over magnesium sulfate and the solvent was evaporated to give the title compound. 1H NMR (DMSO-J6) delta ppm 13.78 (s, 1 H) 8.11 - 8.24 (m, 2 H) 7.49 - 7.66 (m, 1 H); MS (ESI) m/z 315 [M-I]".
Intermediate 31 : 4-lodo-2-(trifluoromethyl)benzoic acid; To a suspension of 4-amino-2-(trifluoromethyl) benzoic acid (10 g, 48.7 mmol, Apollo) in water (43 ml) in an ice-water bath (internal temperature at 5 0C) was added concentrated sulphuric acid specific gravity 1.84 (7 ml_, 131 mmol). To the slight suspension was added a solution of sodium nitrite, super free flowing (3.76 g, 54.5 mmol, Aldrich) in ice cold water (20 ml) dropwise. The suspension was stirred in an ice-water bath for 20 min. To the mixture was added a solution of potassium iodide, extra pure briquettes (12.14 g, 73.1 mmol, Acros) in ice cold 1 M sulphuric acid (30 ml). The mixture was allowed to warm to ambient temperature and then heated to 800C for 45 min under nitrogen. The mixture was allowed to cool to ambient temperature. The mixture was partitioned between ethyl acetate (300 ml) and water(300 ml). The phases were separated and the organic phase washed with brine (50 ml x 2), dried (MgSO4), filtered and the solvent removed in vacuo to give the title compound as a dark brown solid (16.7 g); LCMS: (System 4) (M-H)" = 315, tREtau =2.64 min.
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