反应详情

13.3 g (61.5 mmol) of the compound from Example 10A were dissolved in 200 ml of acetone and 100 ml of water, 1.87 g (9.84 mmol) of 4-toluenesulphonic acid monohydrate were added and the mixture was stirred at room temperature for two days. The acetone was then distilled off, the aqueous residue was neutralized by addition of sodium bicarbonate and 23.2 g of sodium chloride were added. The mixture was extracted repeatedly with ethyl acetate and the combined organic phases were washed with saturated aqueous sodium chloride solution, dried over sodium sulphate, filtered and concentrated. This gave 10.3 g (97% of theory) of the title compound.

1. distillationThe acetone was then distilled off
2. additionthe aqueous residue was neutralized by addition of sodium bicarbonate and 23.2 g of sodium chloride
3. additionwere added
4. extractionThe mixture was extracted repeatedly with ethyl acetate
5. washthe combined organic phases were washed with saturated aqueous sodium chloride solution
6. dry with materialdried over sodium sulphate
7. filtrationfiltered
8. concentrationconcentrated