2-Tolyl isocyanate → methyl 3-bromo-4-[N'-(2-methylphenyl)ureido]phenylacetate
反応式
[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]([O:11][CH3:12])=[O:10])=[CH:4][C:3]=1[Br:13].[CH3:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=1[N:21]=[C:22]=[O:23]>C1COCC1>[Br:13][C:3]1[CH:4]=[C:5]([CH2:8][C:9]([O:11][CH3:12])=[O:10])[CH:6]=[CH:7][C:2]=1[NH:1][C:22]([NH:21][C:16]1[CH:17]=[CH:18][CH:19]=[CH:20][C:15]=1[CH3:14])=[O:23]参加物
4
実験手順
To a mixture of methyl 4-amino-3-bromophenylacetate (587 mg, 2.40 mmol) and 2-methylphenyl isocyanate (0.287 ml, 2.40 mmol) in THF (2 ml) was added Et3 N (33 ml, 0.24 mmol) at room temperature. After 21 h stirring, the reaction mixture was concentrated in vacuo. The residue was triturated by the addition of n-hexane to give methyl 3-bromo-4-[N′-(2-methylphenyl)ureido]phenylacetate (650 mg, 72%) as a pale brown powder. 1H-NMR (CDCl3) δ2.34 (s, 3H), 3.53 (s, 2H), 3.68 (s, 3H), 6.18 (br, 1H), 6.96 (br, 1H), 7.18–7.33 (m, 4H), 7.29 (d, J=4.4 Hz, 1H), 7.30 (d, J=7.3 Hz, 1H), 8.19 (d, J=8.3 Hz, 1H); MS (ESI) m/z 377 (M+), 379 (M++2).