反应详情

To 3-ethoxycarbonylmethylene-8-azabicyclo[3.2.1]octane-8-carboxylic acid tert-butyl ester (12.3 g, 41.8 mmol) in CH2Cl2 was added TFA (10 ml) and the reaction was stirred for 8 h. The solution was concentrated under reduced pressure, diluted with CH2Cl2, and washed first with 2 M NaOH and followed by brine. The water phases were thereafter back-extracted with EtOAc and the combined organic phase was dried (Na2SO4), filtered, and concentrated under reduced pressure. The crude title product was used without further purification (7.04 g, 37.9 mmol, 91%).

1. concentrationThe solution was concentrated under reduced pressure
2. additiondiluted with CH2Cl2
3. washwashed first with 2 M NaOH
4. extractionThe water phases were thereafter back-extracted with EtOAc
5. dry with materialthe combined organic phase was dried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe crude title product was used without further purification (7.04 g, 37.9 mmol, 91%)