反应详情

To a stirred solution of tert-butyl 4-[N′-(2,6-dichlorophenyl)ureido]-3-methylphenylacetate (2.58 g, 6.30 mmol) in CH2Cl2 (50 ml) was added TFA (20 ml) at room temperature. After 2 h stirring, the mixture was concentrated in vacuo. The residue was triturated by the addition of water, to give 4-[N′-(2,6-dichlorophenyl)ureido]-3-methylphenylacetic acid (2.12 g, 95%) as a colorless powder. mp 274–283° C. (dec.); 1H-NMR (DMSO-d6) δ 2.24 (s, 3H), 3.46 (s, 2H), 7.00 (d, J=8.6 Hz, 1H), 7.06 (s, 1H), 7.30 (t, J=7.8 Hz, 1H), 7.52 (d, J=8.3 Hz, 2H1), 7.65 (d, J=8.2 Hz, 1H), 8.12 (s, 1H), 8.50 (s, 1H), 12.22 (br, 1H); MS (ESI) m/z 353 (M++1), 355 (M++3), 357 (M++5).

1. concentrationthe mixture was concentrated in vacuo
2. customThe residue was triturated by the addition of water