m-Chloroperbenzoic acid → 5-(oxiran-2-yl)-2-benzofuran-1(3H)-one

Participants

Reaction Steps

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.

Provenance & Evidence