Water → 2-acetyl-2-azabicyclo[2.2.1]hept-5-en-3-one

100 g of (±)-2-azabicyclo[2.2.1]hept-5-en-3-one were dissolved in acetonitrile (800 ml) and pyridine (161.26 ml) under nitrogen. At 12° C., 104.5 g of acetyl chloride were added dropwise over the course of 2 hours. The mixture was then stirred at room temperature for 4.5 hours. 800 ml of water were added to the mixture, and the acetonitrile was evaporated off in vacuo. The aqueous phase was extracted 3 times with 400 ml of ethyl acetate. The combined org. phases were washed with 1N HCl (400 ml), water (400 ml), saturated NaCl (400 ml), dried with magnesium sulphate and completely evaporated. The residue was taken up in methylene chloride and filtered through silica gel. The filtrate was concentrated and the product was purified by distillation. 107.76 g of product were obtained as a clear liquid. The yield was 71%.

1. customthe acetonitrile was evaporated off in vacuo
2. extractionThe aqueous phase was extracted 3 times with 400 ml of ethyl acetate
3. washphases were washed with 1N HCl (400 ml), water (400 ml), saturated NaCl (400 ml)
4. dry with materialdried with magnesium sulphate
5. customcompletely evaporated
6. filtrationfiltered through silica gel
7. concentrationThe filtrate was concentrated
8. distillationthe product was purified by distillation

ORD record

ord-03dba185a12044dba265c4d16712f7c8

Source dataset

uspto-grants-2004_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06787347B2