反应详情

100 g (346 mmol) of the compound from Example 61A (alternative synthesis) and 30.7 g (450 mmol) of imidazole are dissolved in 1 l of anhydrous N,N-dimethylformamide. A solution of 117 g (416 mmol) of tert-butyl(chloro)diphenylsilane in 150 ml of N,N-dimethylformamide is added dropwise, and the mixture is stirred at RT for 3 h. Water and ethyl acetate are then added, the phases are separated and the organic phase is washed with water, dried over sodium sulphate, filtered and evaporated under reduced pressure. The residue is triturated with petroleum ether/diethyl ether (10:1). After filtration, the residue is washed with petroleum ether and then air-dried. This gives 150 g (82% of theory) of the desired product.

1. customthe phases are separated
2. washthe organic phase is washed with water
3. dry with materialdried over sodium sulphate
4. filtrationfiltered
5. customevaporated under reduced pressure
6. customThe residue is triturated with petroleum ether/diethyl ether (10:1)
7. filtrationAfter filtration
8. washthe residue is washed with petroleum ether
9. customair-dried