反应详情

N-Bromosuccinimide (2.35 g) and azo(bisisobutyronitrile) (60 mg) were added to a solution of compound C (3.2 g) in carbon tetrachloride (60 ml). The mixture was heated under reflux for 4 hours and then cooled to ambient temperature. Insoluble material was removed by filtration and the filtrate was concentrated. The residue was recrystallised from hexane to give methyl 2-(5-bromomethyl-benzoxazol-2-yl)benzoate (D) (2.1 g), m.p. 92°-95° C; NMR: 3.9(s, 3H), 4.65(s, 2H), 7.45(dd, 1H), 7.55(dd, 1H), 7.6-7.7(m, 2H), 7.8-7.85(m, 2H), 8.0-8.1(m, 1H).

1. temperatureThe mixture was heated
2. temperatureunder reflux for 4 hours
3. customInsoluble material was removed by filtration
4. concentrationthe filtrate was concentrated
5. customThe residue was recrystallised from hexane