反应详情

The (3-fluoro-4-methoxyphenyl)acetic acid methyl ester (5.16 g, 26.0 mmol) is dissolved in carbon tetrachloride (300 mL) along with NBS (5.56 g, 31.3 mmol) and benzoyl peroxide (0.63 g, 2.60 mmol) and refluxed for 2 h. The solution is then allowed to cool to room temperature and is filtered. The filtrate is evaporated and the residue purified via flash column chromatography (EtOAc/hexanes 5:95→EtOAc/hexanes 2:8) to give bromo-(3-fluoro-4-methoxyphenyl)acetic acid methyl ester as a yellow oil. 1H NMR (CDCl3) δ 7.37 (d, J=12 Hz, 1H), 7.26-7.23 (m, 1H), 6.93 (t, J=8 Hz, 1H), 5.31 (s, 1H), 3.91 (s, 3H), 3.81 s, 3H).

1. temperaturerefluxed for 2 h
2. filtrationis filtered
3. customThe filtrate is evaporated
4. customthe residue purified via flash column chromatography (EtOAc/hexanes 5:95→EtOAc/hexanes 2:8)