反应详情

To a stirred solution of 5-cyclohexylpentyl-magnesium bromide (1.32 mmol, prepared from 0.31 g., 1.32 mmol 1-bromo-5-cyclohexylpentane and 2.88 mmol magnesium, with a catalytic amount of 1,2-dibromoethane as initiator), in 2.5 ml anhydrous tetrahydrofuran at 0° under argon was added dropwise 5-trimethylsilyl-3-furaldehyde (0.23 g., 1.40 mmol) in 2.5 ml tetrahydrofuran. This solution was allowed to warm to room temperature, stirred for one hour, and then poured over crushed ice containing several drops of concentrated sulfuric acid. The resulting mixture was partitioned between ethyl ether and 5% sodium bicarbonate. The organic portion was washed with water, saturated sodium chloride, dried over magnesium sulfate, filtered and concentrated to give a colorless oil (0.173 g.). This material was purified by flash chromatography (silica, 90% petroleum ether/ethyl ether) to give the desired alcohol.

1. additionpoured
2. customThe resulting mixture was partitioned between ethyl ether and 5% sodium bicarbonate
3. washThe organic portion was washed with water, saturated sodium chloride
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. customto give a colorless oil (0.173 g.)
8. customThis material was purified by flash chromatography (silica, 90% petroleum ether/ethyl ether)