反应详情

To a round flask of 5 ml having a magnet stirrer put therein, 19.1 mg (0.01 mmol) of the catalyst (tetrahydrate) obtained in Example 8 and 1 ml of dichloromethane were added for dissolution, then benzaldehyde (10 μl, 0.1 mmol) and 1-methoxy-3-trimethylsilyloxy-1,3-butadiene (purity: 90%, 30.0 μl, 0.150 mmol) were added thereto, and the reaction was carried out at room temperature for 24 hours. After the reaction had been completed, two drops of trifluoroacetic acid was added by a microsyringe, three drops of pyridine was added by a microsyringe, and 1 ml of water was added. Successively, extraction with dichloromethane, drying over anhydrous magnesium sulfate, concentration and purification by preparative silica gel column chromatography (hexane/ethyl acetate=4/1) were carried out to obtain 16.1 mg of the desired compound (R)-2-phenyl-2,3-dihydro-4H-pyran-4-one. As a result of analysis, the yield was 93% and the optical purity was 19% (R).

1. customTo a round flask of 5 ml having
2. customa magnet stirrer put
3. additionwere added for dissolution
4. additionwas added
5. extractionSuccessively, extraction with dichloromethane
6. dry with materialdrying over anhydrous magnesium sulfate, concentration and purification by preparative silica gel column chromatography (hexane/ethyl acetate=4/1)