反应详情

3-Methyl-5-hexen-2-one (J. Chem. Soc., Chem. Comm. 19, 1991, 1399) (17 g, 106 mmol) and methyl bromoacetate (24.4 g, 159 mmol) were dissolved in tetrahydrofuran (100 mL), and the solution was added dropwise to a tetrahydrofuran (50 mL) (zinc (10.4 g, 159 mmol) and trimethyl borate (30 mL)) solution under reflux. After reflux for 3 hours, the mixture was cooled to room temperature, and glycerin (30 mL) and a saturated aqueous solution of ammonia chloride (100 mL) were added thereto, followed by two extractions with ethyl acetate. The ethyl acetate layer was washed with saturated saline, then dried, and then concentrated. The residue was purified by silica gel column chromatography (200 g) to obtain the compound of interest as an oil substance (11.7 g, 60%).

1. temperatureunder reflux
2. temperatureAfter reflux for 3 hours
3. extractionfollowed by two extractions with ethyl acetate
4. washThe ethyl acetate layer was washed with saturated saline
5. customdried
6. concentrationconcentrated
7. customThe residue was purified by silica gel column chromatography (200 g)
8. customto obtain the compound of interest as an oil substance (11.7 g, 60%)