反应详情

To a solution of 1-isocyanato-2-(trifluoromethyl)benzene (4.0 g, 21.4 mmol) in 50 mL of THF at 0° C. was added potassium tert-butoxide (32.0 mL of a 1M solution in THF, 32 mmol) dropwise. The reaction was allowed to stir for 3 h with warming to ambient temperature and then was quenched with 10 mL of water. The mixture was diluted with ethyl acetate and the organics were washed sequentially with 1N HCl, sat'd. aq. NaHCO3 and brine, dried (MgSO4) and concentrated. The residue was taken up in chloroform, filtered through a pad of silica gel and concentrated to afford 2.9 g (52%) of the title compound which was sufficiently pure to be used without further purification. 1H NMR (CDCl3): δ 8.13 (d, 1H, J=8.2 Hz), 7.56 (d, 1H, J=7.7 Hz), 7.52 (t, 1H, J=8.0 Hz), 7.14 (t, 1H, J=7.7 Hz), 6.80 (broad s, 1H), 1.53 (s, 9H).

1. customwas quenched with 10 mL of water
2. additionThe mixture was diluted with ethyl acetate
3. washthe organics were washed sequentially with 1N HCl
4. dry with materialaq. NaHCO3 and brine, dried (MgSO4)
5. concentrationconcentrated
6. filtrationfiltered through a pad of silica gel
7. concentrationconcentrated