反应详情

To a stirred solution of tert-butyl 3-methyl-4-[N′-(2-trifluoromethylphenyl)ureido]phenylacetate (1.06 g, 2.60 mmol) in CH2Cl2 (10 ml) was added TFA (10 ml) and the reaction mixture was stirred at room temperature for 4 hr. The reaction mixture was concentrated to a small volume and poured into ice-H2O. The resulting precipitate was collected under a reduced pressure and the crude solid was recrystallized from MeOH—CHCl3-IPE to give 3-methyl-4-[N′-(2-trifluoromethylphenyl)ureido]phenylacetic acid (702 mg, 77%) as a white crystalline powder. mp 262–263° C.; 1H-NMR (DMSO-d6) δ 2.24 (s, 3 H), 3.48 (s, 2 H), 7.03 (d, J=8.3 Hz, 1 H), 7.08 (s, 1 H), 7.26–7.30 (m, 1 H), 7.61–7.69 (m, 3 H), 7.88 (d, J=8.3 Hz, 1 H), 8.39 (s, 1 H), 8.55(s, 1 H), 12.28 (br s, 1 H); Anal. Calcd for C17H15F3N2O3: C, 57.96; H, 4.29; N, 7.95; F, 16.18. Found: C, 57.73; H, 4.23; N, 7.92; F, 16.05.

1. concentrationThe reaction mixture was concentrated to a small volume
2. additionpoured into ice-H2O
3. customThe resulting precipitate was collected under a reduced pressure
4. customthe crude solid was recrystallized from MeOH—CHCl3-IPE