Hydrogen Peroxide → 2,3-Epoxychromone

関与物質

反応条件

反応手順

Chromone (3 g) was dissolved in ether (200 ml) and the solution was cooled to 0° C. in ice water. Then, 30% hydrogen peroxide (15 ml) and Triton B (10 ml) solution were added portionwise. The whole was stirred at 0° C. for 4 hours. After adding ice water, the reaction liquor was extracted with dichloromethane. The organic layer was washed with sodium thiosulfate, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was fractionatedby silica gel column chromatography (diethyl ether/hexane =1:8) to give the titled compound (2.34 g; yield =75%). Melting point: 66°-67° C. Mass spectrum (M+): 162. 1H-NMR(CDCl3, δ ppm): 3.69 (d, 1H, H3), 5.67 (d, 1H, H2), 7.05 (d, 1H, H8), 7.14 (t, 1H, H6), 7.54 (t, 1H, H7), 7.79 (dd, 1H, H5).

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