反应详情

A solution of 5.00 g (38.7 mmol) of 3-hydroxymethylpiperidin-2-one in 40 ml of N,N-dimethylformamide is admixed successively with 3.16 g (46.5 mmol) of imidazole, and dropwise with 11 ml (42.6 mmol) of tert-butyl(diphenyl)silyl chloride. After stirring at RT for 3 hours, the mixture is admixed with approx. 400 ml of water and extracted three times with ethyl acetate. The combined organic extracts are washed successively with saturated ammonium chloride solution, water and saturated sodium chloride solution. After drying over anhydrous magnesium sulfate, the mixture is filtered and the filtrate is freed of the solvent under reduced pressure. The resulting residue is purified by suction filtration through silica gel with 20:1→1:1 cyclohexane/ethyl acetate as the eluent. This affords 9.43 g (66% of theory) of the title compound.

1. extractionextracted three times with ethyl acetate
2. washThe combined organic extracts are washed successively with saturated ammonium chloride solution, water and saturated sodium chloride solution
3. dry with materialAfter drying over anhydrous magnesium sulfate
4. filtrationthe mixture is filtered
5. filtrationThe resulting residue is purified by suction filtration through silica gel with 20:1→1:1 cyclohexane/ethyl acetate as the eluent