反应详情

To a solution of tert-butyl 1-oxo-2,8-diazaspiro[4.5]decane-8-carboxylate (330 mg, 1.298 mmol) and iodomethane (0.085 mL, 1.362 mmol) in THF (10 mL) was cooled in an ice bath. Sodium hydride (78 mg, 1.946 mmol) was added and the ice bath was removed. The reaction was stirred at room temperature for 4 hrs. The reaction mixture was diluted with EtOAc and washed with sat NaHCO3; the aqueous layer was extracted with EtOAc. Then the combined organics were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The crude product was purified by chromatography (silica gel, Hexanes/EtOAc gradient 0 to 100% EtOAc) to give tert-butyl 2-methyl-1-oxo-2,8-diazaspiro[4.5]decane-8-carboxylate (315 mg).

1. customthe ice bath was removed
2. additionThe reaction mixture was diluted with EtOAc
3. washwashed
4. extractionthe aqueous layer was extracted with EtOAc
5. washThen the combined organics were washed with brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe crude product was purified by chromatography (silica gel, Hexanes/EtOAc gradient 0 to 100% EtOAc)