反应详情

To a cooled solution of (R)-N-[3-amino-2-chlorophenyl]-2-hydroxy-2-methyl-3,3,3-trifluoropropanamide (Method 8) (12.5 g) in concentrated sulphuric acid (25 ml) and water (70 ml) was added a solution of sodium nitrite (3.15 g) in water (70 ml) dropwise. The reaction mixture was allowed to stir for 10 minutes and for 1 hour at ambient temperature. A solution of potassium iodide (22.2 g) in water (70 ml) was added cautiously and the mixture was heated to 100° C. for 2.5 hours. The reaction mixture was allowed to cool to ambient temperature, EtOAc (500 ml) was added and the organic phase was washed with brine (300 ml) and dried. Volatile material was removed by evaporation and the residue was purified by flash column chromatography eluting with 5-20% EtOAc/isohexane to give the title compound (13.5 g) as a cream solid. NMR (CDCl3) 1.76 (s, 3H), 3.63 (s, 1H), 7.05 (t, 1H), 7.68 (d, 1H), 8.36 (d, 1H), 8.97 (brs, 1H); m/z: 392.

1. temperaturethe mixture was heated to 100° C. for 2.5 hours
2. temperatureto cool to ambient temperature
3. washthe organic phase was washed with brine (300 ml)
4. customdried
5. customVolatile material was removed by evaporation
6. customthe residue was purified by flash column chromatography
7. washeluting with 5-20% EtOAc/isohexane