反应详情

11.80 g (49.12 mmol) of 8-methoxy-8-(trifluoromethyl)-1,4-dioxaspiro[4.5]decane (Example 9A) were dissolved in 236 ml of acetone and 118 ml of water, 1.50 g (7.86 mmol) of 4-toluenesulphonic acid monohydrate were added and the mixture was heated at reflux overnight. The mixture was then poured into 1.2 l of water and the product was extracted with diethyl ether. The organic phase was washed with water, dried over sodium sulphate and concentrated under reduced pressure. The resulting residue was distilled under reduced pressure (boiling point: 106-110° C. at 40 mbar). This gave 6.86 g (71% of theory) of the title compound as a yellowish oil.

1. temperaturethe mixture was heated
2. temperatureat reflux overnight
3. extractionthe product was extracted with diethyl ether
4. washThe organic phase was washed with water
5. dry with materialdried over sodium sulphate
6. concentrationconcentrated under reduced pressure
7. distillationThe resulting residue was distilled under reduced pressure (boiling point: 106-110° C. at 40 mbar)