反应详情

To a solution of (±)-3-hydroxy-7-(trifluoromethyl)isobenzofuran-1 (3H)-one, from Example 1, Part B, (3.31 g, 15.2 mmol) in 20 mL of DMF was added potassium carbonate (4.2 g, 30.4 mmol) followed by iodomethane (1.04 mL, 16.7 mmol). The resulting mixture was allowed to stir at ambient temperature for 18 h. The reaction was cooled to 0° C. and carefully acidified with 6N HCl, diluted with water and extracted with EtOAc. The organics were washed with sat'd aq NaHCO3 and brine, dried (MgSO4), filtered through a pad of silica gel and concentrated in vacuo to afford 3.1 g (89%) of the title compound which was used without purification. 1H NMR (CDCl3): δ 10.05 (s, 1H), 8.12 (d, 1H, J=7.7 Hz), 7.95 (d, 1H, J=7.7 Hz), 7.76 (t, 1H, J=7.7 Hz), 4.02 (s, 3H).

1. temperatureThe reaction was cooled to 0° C.
2. extractionextracted with EtOAc
3. washThe organics were washed with sat'd aq NaHCO3 and brine
4. dry with materialdried (MgSO4)
5. filtrationfiltered through a pad of silica gel
6. concentrationconcentrated in vacuo