反应详情

6-Cyclopropyl-5-vinyl-2-benzofuran-1(3H)-one (0.45 g, 2.25 mmol) was dissolved in dichloromethane (10 mL) and treated with meta-chloro perbenzoic acid (1 g, 6.3 mmol) at 0° C. and stirred for 12 h. TLC indicated completion of the reaction; the mixture was diluted with saturated sodium bicarbonate solution and extracted with dichloromethane (2×). The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. The epoxide was purified by silica gel column chromatography (hexanes/EtOAc=1/1) to give 6-Cyclopropyl-5-oxiran-2-yl-2-benzofuran-1(3H)-one. The oxirane was further resolved over a chiral column giving two isomers:

1. customcompletion of the reaction
2. extractionextracted with dichloromethane (2×)
3. washThe combined organic extracts were washed with brine
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe epoxide was purified by silica gel column chromatography (hexanes/EtOAc=1/1)