反应详情

100 ml of a 0.1 M solution of samarium(II) iodide in tetrahydrofuran is mixed, with oxygen carefully excluded, with the solution of 710 mg of 3,4-dimethoxyacetophenone, 500 mg of methyl acrylate and 350 mg of tert-butanol in 5 ml of tetrahydrofuran. The reaction solution is mixed thoroughly, allowed to stand for two hours at room temperature and then poured into 100 ml of 20% hydrochloric acid. It is stirred for two hours at room temperature and extracted with diethyl ether. The ether phase is washed with sodium thiosulfate solution and water, dried on sodium sulfate and concentrated by evaporation in a vacuum. The oily residue is chromatographed on a silica gel column (Kromasil 100/10 μm) with a hexane-tert-butyl methyl ether mixture (4:1). 570 mg of (R,S)-5-(3,4-dimethoxyphenyl)-5-methyl-dihydro-2-furanone is eluted, melting point 71.2° C.

1. additionThe reaction solution is mixed thoroughly
2. extractionextracted with diethyl ether
3. washThe ether phase is washed with sodium thiosulfate solution and water
4. customdried on sodium sulfate
5. concentrationconcentrated by evaporation in a vacuum
6. customThe oily residue is chromatographed on a silica gel column (Kromasil 100/10 μm) with a hexane-tert-butyl methyl ether mixture (4:1)
7. wash570 mg of (R,S)-5-(3,4-dimethoxyphenyl)-5-methyl-dihydro-2-furanone is eluted