反应详情

A solution of 4-bromo-2-benzofuran-1(3H)-one (4.02 g, 18.9 mmol) in aqueous sodium hydroxide solution (1M, 18.9 ml) was heated at 100° C. for 1 h. The solution was concentrated in vacuo and the residue was dissolved in toluene and re-concentrated. To a solution of the residue in N,N-dimethylformamide (20 ml) was added benzyl bromide (2.26 ml, 18.90 mmol) and the reaction mixture was stirred at room temperature for 14 days. The mixture was poured into water and the resulting precipitate was collected by filtration, washed with water and pentane and dried to give the title compound (4.77 g).

1. concentrationThe solution was concentrated in vacuo
2. dissolutionthe residue was dissolved in toluene
3. concentrationre-concentrated
4. filtrationthe resulting precipitate was collected by filtration
5. washwashed with water and pentane
6. customdried