反应详情

24 g (81 mmol) of the compound from Example 21A are dissolved in 200 ml of anhydrous N,N-dimethylformamide, and 7.2 g (106 mmol) of imidazole and 27 g (98 mmol) of tert-butyl(chloro)diphenylsilane are added. After 16 h, the mixture is diluted with 1.2 l of water and extracted three times with ethyl acetate. The combined organic phases are washed twice with water, dried over magnesium sulphate, filtered and concentrated under reduced pressure. For crystallization, tert-butyl methyl ether is added, and the resulting crystals are filtered off and dried under reduced pressure. This gives 30 g (67% of theory) of the desired product.

1. extractionextracted three times with ethyl acetate
2. washThe combined organic phases are washed twice with water
3. dry with materialdried over magnesium sulphate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customFor crystallization, tert-butyl methyl ether
7. additionis added
8. filtrationthe resulting crystals are filtered off
9. customdried under reduced pressure