反应详情

温度

0 °C

8.0 g (46 mmoles) of N-bromosuccinimide were dissolved in 60 ml of dry dichloromethane and were cooled to 0° C. To the mixture were added drop by drop 4 ml (50 mmoles) of dimethyl sulphide dissolved in 40 ml of chloromethane. The mixture was stirred for 10 minutes at 0° C. At the end of that time 5.46 (42 mmoles) of a solution of methyl 3-hydroxy-2-methylidene-butanoate in 40 ml of dichloromethane were slowly added to it. The resulting suspension was stirred for 24 hours at room temperature until a transparent solution was obtained. To this mixture was added n-hexane (100 ml) and it was poured into a separating funnel containing 200 ml of a saturated solution of sodium chloride and ice. The organic phase was washed with 100 ml of a saturated solution of sodium chloride. The aqueous phases were extracted with diethyl ether (2×100 ml), they were washed with water (3×100 ml) and they were dried over anhydrous sodium sulphate. They were vacuum concentrated giving 7.45 g (92% yield) of a syrupy liquid of methyl 2-bromomethyl-2-butanoate.

1. stirringThe resulting suspension was stirred for 24 hours at room temperature until a transparent solution
2. customwas obtained
3. additionwas poured into a separating funnel
4. washThe organic phase was washed with 100 ml of a saturated solution of sodium chloride
5. extractionThe aqueous phases were extracted with diethyl ether (2×100 ml), they
6. washwere washed with water (3×100 ml) and they
7. dry with materialwere dried over anhydrous sodium sulphate
8. concentrationconcentrated