反应详情

To a mixture of (1RS,2SR,6RS,7SR)-10-oxatricyclo[5.2.1.02,6]decane-3,5-dione (166 mg, 1 mmol) and 4-dimethylaminopyridine (610 mg, 5 mmol) under an atmosphere of nitrogen is added dry chloroform (5.6 ml), and the mixture is stirred at room temperature until all the solids are dissolved. To this solution is then added dry toluene (2 ml), and 3,5-dimethylbiphen-4-yllead triacetate (0.5 M solution in dry chloroform, 2.4 ml, 1.2 mmol). The reaction mixture is heated at reflux for 1 hour, then cooled to room temperature, acidified to pH1 with 2N aqueous hydrochloric acid, filtered and extracted with dichloromethane. The organic extracts are combined, dried over anhydrous magnesium sulfate, filtered and the filtrate evaporated under reduced pressure. The crude product is purified by column chromatography on silica gel to give (1RS,2SR,6RS,7SR)-4-(3,5-dimethylbiphen-4-yl)-10-oxa-tricyclo[5.2.1.02,6]decane-3,5-dione.

1. dissolutionare dissolved
2. temperatureThe reaction mixture is heated
3. temperatureat reflux for 1 hour
4. temperaturecooled to room temperature
5. filtrationfiltered
6. extractionextracted with dichloromethane
7. dry with materialdried over anhydrous magnesium sulfate
8. filtrationfiltered
9. customthe filtrate evaporated under reduced pressure
10. customThe crude product is purified by column chromatography on silica gel