反应详情

8.2 g of 2-ethyl-2-methyl-5-{4-(methylsulfinyl)phenyl}-3(2H)-furanone in 200 ml carbon tetrachloride and 200 ml chloroform was mixed with 6.8 g of [bis(trifluoroacetoxy)iodo]benzene (BTI) and 4.1 g of iodine. The mixture was stirred at room temperature for 6 hours, followed by quenching the reaction by adding saturated aqueous sodium thiosulfate until the characteristic color of iodine disappeared. The quenched solution was extracted with 300 ml water and dichloromethane (200 ml×3). The organic layer was concentrated in vacuo and the resulting residue was purified by column chromatography (hexane/ethylacetate=1:1) to give 10.0 g of 2-ethyl-4-iodo-2-methyl-5-{4-(methylsulfinyl)phenyl}-3(2H)-furanone. NMR: δ0.89 (t, J=7.5 Hz, 3H), 1.51 (s, 3H), 1.93 (m, 2H), 2.73 (s, 3H), 7.81 (d, J=8.7 Hz, 2H), 8.38 (d, J=8.7 Hz, 2H).

1. customby quenching
2. customthe reaction
3. extractionThe quenched solution was extracted with 300 ml water and dichloromethane (200 ml×3)
4. concentrationThe organic layer was concentrated in vacuo
5. customthe resulting residue was purified by column chromatography (hexane/ethylacetate=1:1)