反应详情

A suspension of sodium hydride (4.60 g, 115 mmol) in tetrahydrofuran (20 mL) was treated with dimethyl carbonate (8.29 mL, 99 mmol), heated to reflux under nitrogen, treated dropwise with a solution of octahydronaphthalen-1(2H)-one (Aldrich cat#115063, mixture of trans (major) and cis (minor), 5 g, 32.8 mmol) in tetrahydrofuran (20 mL) over 5 minutes, and heated to reflux overnight. The mixture was cooled, diluted with ether (300 mL) and treated with 1 M hydrochloric acid (150 mL). The layers were separated and the aqueous layer was extracted with ether (2×100 mL). The combined ether layers were washed with brine, dried (magnesium sulfate), filtered and concentrated to provide the desired product that was not purified, but used as is in the next step.

1. temperatureheated
2. temperatureto reflux under nitrogen
3. temperatureheated
4. temperatureto reflux overnight
5. temperatureThe mixture was cooled
6. customThe layers were separated
7. extractionthe aqueous layer was extracted with ether (2×100 mL)
8. washThe combined ether layers were washed with brine
9. dry with materialdried (magnesium sulfate)
10. filtrationfiltered
11. concentrationconcentrated