反应详情

106.1 g zinc dust was added to a mixture of 62.5 g tert-butyl 1,1-dichloro-2-oxo-7-azaspiro[3.5]nonane-7-carboxylate and 500 ml saturated ammonium chloride in methanol. The mixture was stirred for 1 hr and 20 min at room temperature and filtered through Celite. The filtrate was evaporated, 1 N hydrochloric acid/ethyl acetate was added thereto, and the organic layer was recovered. The extract was washed with water, saturated sodium bicarbonate and brine, dried over anhydrous magnesium sulfate, and filtered. The filtrate was evaporated, and the resulting residue was subjected to silica gel column chromatography to give 38.9 g of tert-butyl 2-oxo-7-azaspiro[3.5]nonane-7-carboxylate.

1. filtrationfiltered through Celite
2. customThe filtrate was evaporated
3. addition1 N hydrochloric acid/ethyl acetate was added
4. customthe organic layer was recovered
5. washThe extract was washed with water, saturated sodium bicarbonate and brine
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered
8. customThe filtrate was evaporated