反应详情

To a stirred mixture of tert-butyl 4-amino-3-methylphenylacetate (780 mg, 3.30 mmol), 2-bromo phenyl isocyanate (0.41 ml, 3.30 mmol) in THF (7 ml) was added Et3 N (0.092 ml, 0.66 mmol) at room temperature. After 3 h stirring, the reaction mixture was concentrated in vacuo. The residue was triturated by the addition of n-hexane, to give tert-butyl 4-[N′-(2-bromophenyl) ureido]-3-methylphenylacetate (1.57 g, 93%) as a pale yellow powder. mp 138–145° C. (dec.); 1H-NMR (CDCl3) δ 1.44 (s, 9H), 2.33 (s, 3H), 3.51 (s, 2H), 6.90 (dt, J=9.0, 1.4 Hz, 1H), 6.98 (br, 1H), 7.18–7.31 (m, 4H), 7.39 (dd, J=8.1, 2.9 Hz, 1H), 7.44 (d, J=8.0 Hz, 1H), 8.22 (d, J=8.3 Hz, 2H); Anal. Calcd for C20H22BrN2O3.0.2H2O: C, 56.80; H, 5.58; N, 6.62. Found: C, 56.85; H, 5.42; N, 6.62.

1. additionwas added Et3 N (0.092 ml, 0.66 mmol) at room temperature
2. concentrationthe reaction mixture was concentrated in vacuo
3. customThe residue was triturated by the addition of n-hexane