反应详情

A 1 mol/L sodium hydroxide solution (70.8 mL) and tetrahydrofuran (78.8 mL) were added to a solution of [(1R*,6R*)-8-benzyloxycarbonyl-8-azabicyclo[4.3.0]nonan-1-yl]carboxylic acid methyl ester (7.50 g, 23.6 mmol) in methanol (78.8 mL) in a nitrogen atmosphere, and the mixture was stirred at room temperature for three days. The reaction solution was concentrated under reduced pressure and then washed with diethyl ether (50 mL×2). The aqueous layer was made acidic with 3 mol/L hydrochloric acid (28 mL) under ice-cooling, followed by extraction with ethyl acetate (100 mL×2). The organic layer was washed with brine (250 mL) and dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure to give 6.70 g of the title compound.

1. concentrationThe reaction solution was concentrated under reduced pressure
2. washwashed with diethyl ether (50 mL×2)
3. temperaturecooling
4. extractionfollowed by extraction with ethyl acetate (100 mL×2)
5. washThe organic layer was washed with brine (250 mL)
6. dry with materialdried over anhydrous sodium sulfate
7. filtrationAfter filtration
8. concentrationthe filtrate was concentrated under reduced pressure