反应详情

5-Ethenyl-2-benzofuran-1(3H)-one (28.4 g, 177 mmol) was dissolved in DCM (400 mL) then mCPBA (47.7 g, 213 mmol) was added. The mixture was stirred at room temperature overnight. Some starting olefin remained. Another 25 g of mCPBA was added and the mixture was stirred overnight. The mixture was poured into ice cold Na2SO3 solution (saturated). The layers were separated and the organic layer was washed with 5% NaOH solution, brine, then was dried (MgSO4). The crude product was purified by MPLC (330 g column, eluting with 40% EtOAc/hexane, 2 L, then with 45% EtOAc/hexane, 2 L, to afford 5-(oxiran-2-yl)-2-benzofuran-1(3H)-one. LC-MS: M+1=177.

1. stirringthe mixture was stirred overnight
2. additionThe mixture was poured into ice cold Na2SO3 solution (saturated)
3. customThe layers were separated
4. washthe organic layer was washed with 5% NaOH solution, brine
5. dry with materialwas dried (MgSO4)
6. customThe crude product was purified by MPLC (330 g column
7. washeluting with 40% EtOAc/hexane, 2 L