反应详情

To a stirred solution of tert-butyl 4-[N′-(2-bromophenyl)ureido]-3-methylphenylacetate (1.27 g, 3.03 mmol) in CH2Cl2 (10 ml) was added TFA (5 ml) at room temperature. After 1 h stirring, the mixture was concentrated in vacuo. The residue was triturated by the addition of water, to give 4-[N′-(2-bromophenyl)ureido]-3-methylphenylacetic acid (1.05 g, 95%) as a pale yellow powder. mp 245–248° C. (dec.); 1 H-NMR (CDCl3) δ 2.24 (s, 3H), 3.48 (s, 2H), 6.96 (dt, J=7.3, 1.5 Hz, 1H), 7.02 (d, J=8.3 Hz, 1H), 7.07 (s, 1H), 7.32 (t, J=8.1 Hz, 1H), 7.59–7.66 (m, 2H), 8.44 (s, 1H), 8.62 (s, 1H); MS (ESI), m/z 363 (M++1), 365 (M++3); Anal. Calcd for C16H15BrN2O3.0.7H2O: C, 51.13; H, 4.40; Br, 21.26; N, 7.45. Found: C, 50.84; H, 4.62; Br, 21.72; N, 7.18.

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