N-bromobutanimide → Dimethyl 3-(bromomethyl)phthalate
反応式
[CH3:1][O:2][C:3](=[O:15])[C:4]1[C:5](=[C:10]([CH3:14])[CH:11]=[CH:12][CH:13]=1)[C:6]([O:8][CH3:9])=[O:7].[Br:16]N1C(=O)CCC1=O>C(#N)C>[CH3:1][O:2][C:3](=[O:15])[C:4]1[C:5](=[C:10]([CH2:14][Br:16])[CH:11]=[CH:12][CH:13]=1)[C:6]([O:8][CH3:9])=[O:7]参加物
4
反応条件
- 温度
- 70 °C
実験手順
A stirred mixture of 3-methyl-phthalic dimethyl ester (12.1 g, 57.9 mmol) and N-bromosuccinimide (12.4 g, 69.5 mmol) in acetonitrile (150 mL) was heated at 70° C. (oil bath), while a 200 W light bulb situated 2 cm away was shining on the reaction mixture overnight. The resulting mixture was cooled and concentrated. The residue was dissolved in ethyl acetate (150 mL), washed with water (3×50 mL) and brine (50 mL), and dried (MgSO4). Solvent was removed in vacuo, and the residue was purified by flash chromatography (SiO2, Hexane:EtOAc 8:2) to give 3-bromomethyl-phthalic dimethyl ester (13.9 g, 83%) as a solid: 1H NMR (CDCl3) δ 7.94-7.90 (dd, J=1.1 and 7.9 Hz, 1H), 7.65-7.62 (dd, J=1.0 and 6.9 Hz, 1H), 7.47 (t, J=7.8H, 1H), 4.54 (s, 2H), 3.97 (s, 3H), 3.90 (s, 3H).