反应详情

A solution of bromine (0.14 ml, 2.8 mmol) in dichloromethane (5 ml) is added dropwise to a solution of the enol ether (0.48 g, 2.6 mmol) prepared in step 1 in dichloromethane (40 ml) at 0° C. and the reaction mixture is stirred for 1 hour. Triethylamine (0.64 ml, 4.6 mmol) is then added and the reaction mixture is allowed to warm to room temperature and then stirred for 3 hours. The reaction mixture is washed with 2M aqueous hydrochloric acid and brine, dried over anhydrous magnesium sulfate, filtered and the filtrate evaporated under reduced pressure. The residue is purified by column chromatography on silica gel to give (1RS,2SR,6RS,7SR)-4-bromo-5-methoxy-10-oxatricyclo[5.2.1.02,6]dec-4-en-3-one.

1. stirringstirred for 3 hours
2. washThe reaction mixture is washed with 2M aqueous hydrochloric acid and brine
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltered
5. customthe filtrate evaporated under reduced pressure
6. customThe residue is purified by column chromatography on silica gel