反应详情

A catalytic amount of trifluoroacetic acid was added to a solution of 1-cyclopentene-1-carboxylic acid methyl ester (2.52 g, 20.0 mmol) and N-benzyl-N-(methoxymethyl)-N-trimethylsilylmethylamine (5.00 g, 21.1 mmol) in dichloromethane (40 mL) at room temperature, and the mixture was heated with stirring at room temperature for 15.5 hours. The reaction solution was diluted with dichloromethane (100 mL) and washed with a saturated sodium bicarbonate solution (80 mL). The washed aqueous layer was further extracted with dichloromethane (50 mL). The organic layers were combined and dried over anhydrous sodium sulfate. After filtration, the solvent was evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane:ethyl acetate=95:5→90:10→80:20) to give 4.28 g (83%) of the title compound as a colorless transparent oil.

1. temperaturethe mixture was heated
2. washwashed with a saturated sodium bicarbonate solution (80 mL)
3. extractionThe washed aqueous layer was further extracted with dichloromethane (50 mL)
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationAfter filtration
6. customthe solvent was evaporated under reduced pressure
7. customThe resulting residue was purified by silica gel column chromatography (hexane:ethyl acetate=95:5→90:10→80:20)