反应详情

Triethylamine (1.61 mL, 11.5 mmol) and diphenylphosphoryl azide (1.62 mL, 7.52 mmol) were added to a solution of [(1S,6R)-7-oxo-8-[(1R)-1-phenylethyl]-8-azabicyclo[4.3.0]non-3-en-1-yl]carboxylic acid (1.65 g, 5.78 mmol) in toluene (28.9 mL) in a nitrogen atmosphere with stirring under ice-cooling, and the mixture was stirred at 100° C. for 30 minutes. The reaction solution was concentrated under reduced pressure, and triethylamine was azeotropically distilled with toluene (×3). 1,4-Dioxane (14.4 mL) and 4 mol/L hydrochloric acid (14.4 mL) were added to the resulting residue, and the mixture was stirred at 50° C. for six hours. The reaction solution was diluted with water (30.0 mL) and washed with ethyl acetate (50 mL×2). A 1 mol/L sodium hydroxide solution (55.0 mL) was added to the aqueous layer, followed by extraction with chloroform (100 mL×1, 80 mL×1). The organic layer was washed with brine (150 mL) and dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure to give 1.24 g of the title compound as an amorphous.

1. temperaturecooling
2. stirringthe mixture was stirred at 100° C. for 30 minutes
3. concentrationThe reaction solution was concentrated under reduced pressure, and triethylamine
4. distillationwas azeotropically distilled with toluene (×3)
5. addition1,4-Dioxane (14.4 mL) and 4 mol/L hydrochloric acid (14.4 mL) were added to the resulting residue
6. stirringthe mixture was stirred at 50° C. for six hours
7. additionThe reaction solution was diluted with water (30.0 mL)
8. washwashed with ethyl acetate (50 mL×2)
9. additionA 1 mol/L sodium hydroxide solution (55.0 mL) was added to the aqueous layer
10. extractionfollowed by extraction with chloroform (100 mL×1, 80 mL×1)
11. washThe organic layer was washed with brine (150 mL)
12. dry with materialdried over anhydrous sodium sulfate
13. filtrationAfter filtration
14. concentrationthe filtrate was concentrated under reduced pressure