反应详情

cis-1-Benzyl-3-hydroxy-4-methylpyrrolidine (6.81 g) was dissolved in dichloromethane (70 mL). While the solution was chilled in a dry ice/acetone bath, triethylamine (5.21 mL) was added, followed by dropwise addition of methanesulfonyl chloride (2.89 mL) and stirring for 1 hour. Subsequently, water (50 mL) was added and the mixture was allowed to warm to room temperature. The dichloromethane layer was separated and the aqueous layer was extracted with dichloromethane (50 mL). The dichloromethane layers were combined, washed with water, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The resulting residue was dissolved in acetonitrile (180 mL). To this solution, tetrabutylammonium cyanide (23.9 g) was added and the mixture was refluxed for 7 hours. Subsequently, the reaction mixture was concentrated under reduced pressure and the residue was dissolved in ethyl acetate (300 mL). This solution was washed with water, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was then purified by silica gel column chromatography (hexane:ethyl acetate=1:1) to give cis-1-benzyl-4-methyl-3-pyrrolidinecarbonitrile as a brown oil (4.61 g).

1. temperatureWhile the solution was chilled in a dry ice/acetone bath
2. customThe dichloromethane layer was separated
3. extractionthe aqueous layer was extracted with dichloromethane (50 mL)
4. washwashed with water
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure
7. dissolutionThe resulting residue was dissolved in acetonitrile (180 mL)
8. additionTo this solution, tetrabutylammonium cyanide (23.9 g) was added
9. temperaturethe mixture was refluxed for 7 hours
10. concentrationSubsequently, the reaction mixture was concentrated under reduced pressure
11. dissolutionthe residue was dissolved in ethyl acetate (300 mL)
12. washThis solution was washed with water
13. dry with materialdried over anhydrous sodium sulfate
14. concentrationconcentrated under reduced pressure
15. customThe residue was then purified by silica gel column chromatography (hexane:ethyl acetate=1:1)