反应详情

To a solution of 4-ethyl-5-vinyl-2-benzofuran-1(3H)-one (1.1 g, 5.85 mmol) in 50 mL of DCM was slowly added mCPBA (3.60 g, 85% purity, 17.6 mmol) in 50 mL of DCM at 0° C. The mixture was warmed to room temperature, and then stirred for 3 days. The mixture was washed with aqueous Na2SO3 until KI paper didn't change color. The organic layers were combined, washed with brine and concentrated. The residue was purified by column chromatography to give 4-ethyl-5-oxiran-2-yl-2-benzofuran-1(3H)-one. 1H-NMR (400 MHz, CDCl3) δ ppm 7.75 (d, J=8.6 Hz, 1H), 7.41 (d, J=7.8 Hz, 1H), 5.30 (s, 2H), 4.11-4.13 (m, 1H), 3.23-3.25 (m, 1H), 2.75-2.82 (m, 2H), 2.70-2.72 (m, 1H), 1.27 (t, J=7.4 Hz, 3H).

1. customat 0° C
2. washThe mixture was washed with aqueous Na2SO3 until KI paper didn't change color
3. washwashed with brine
4. concentrationconcentrated
5. customThe residue was purified by column chromatography