反应详情

To a solution of tert-butyl 4-cyanopiperidine-1-carboxylate (0.500 g, 2.38 mmol) in 15 mL of THF at −78° C. was added lithium bis(trimethylsilyl)amide (1 M solution in diethyl ether, 5.23 mL, 5.23 mmol). After 20 min, iodomethane (0.338 g, 2.38 mmol) was added dropwise, and the reaction was slowly warmed to rt. After 15 h, the mixture was cooled to 0° C., treated with water, and extracted 3× with ethyl acetate. The solution was extracted 3× with ethyl acetate, and the combined organic solution was washed with water and brine, dried over sodium sulfate, filtered, and concentrated in vacuo to provide tert-butyl 4-cyano-4-methylpiperidine-1-carboxylate that gave a proton NMR spectra consistent with theory.

1. waitAfter 15 h
2. temperaturethe mixture was cooled to 0° C.
3. extractionextracted 3× with ethyl acetate
4. extractionThe solution was extracted 3× with ethyl acetate
5. washthe combined organic solution was washed with water and brine
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo