反应详情

A solution of 20.5 g (50 mmol) of 4-[3-(acetylamino)cyclopentyl]-α-(ethoxymethylene)-2,5-difluoro-β-oxobenzenepropanoic acid, ethyl ester, in 100 ml of absolute ethanol was cooled to 10° and 3.4 g (60 mmole) of cyclopropylamine was added dropwise maintaining the temperature below 15° with an ice bath. After the addition was complete, the reaction was stirred at 5°-10° for 1.5 hours and then at room temperature for 1 hour. The resulting suspension was chilled to 5° and the solid removed by filtration and washed with ethanol and then hexane. The combined filtrate and washings were evaporated in vacuo and the residue was recrystallized from pentane to give 16.1 g of the title compound.

1. temperaturemaintaining the temperature below 15° with an ice bath
2. additionAfter the addition
3. waitat room temperature for 1 hour
4. temperatureThe resulting suspension was chilled to 5°
5. customthe solid removed by filtration
6. washwashed with ethanol
7. customThe combined filtrate and washings were evaporated in vacuo
8. customthe residue was recrystallized from pentane