Hydrochloric Acid → CyclopentanecarboxaMide, N-phenyl-

To a solution of cyclopentyl bromide (2M in diethyl ether, 317 m].) was added dropwise a solution of 2-amino benzonitrile (25.0 g) in dry diethyl ether (400 ml) at 5°-10° C. under stirring for 2 hours. After completion of the addition, the mixture was allowed to warm to room temperature and then stirred at ambient temperature overnight. The reaction mixture was treated with 5N aqueous hydrochloric acid (150 ml) at 10°-20° C. and then stirred at room temperature for additional 30 minutes. To the mixture was added dropwise 5N sodium hydroxide aqueous solution. The resultant mixture was filtered by suction to remove an insoluble inorganic material. The organic layer was separated from the filtrate. The aqueous layer was extracted with ethyl acetate (2×200 ml). The organic layer and the extracts were combined and washed with a brine (100 ml). Dryness over sodium sulfate and evaporation under reduced pressure gave a crude product. The product was subjected by column chromatography on silica gel with a mixture of n-hexane and ethyl acetate (10:1) as an eluent to give |-cyclopentylcarbonylaniline (37.4 g) as a yellow oil.

1. additionAfter completion of the addition
2. stirringstirred at ambient temperature overnight
3. stirringstirred at room temperature for additional 30 minutes
4. filtrationThe resultant mixture was filtered by suction
5. customto remove an insoluble inorganic material
6. customThe organic layer was separated from the filtrate
7. extractionThe aqueous layer was extracted with ethyl acetate (2×200 ml)
8. washwashed with a brine (100 ml)
9. customDryness over sodium sulfate and evaporation under reduced pressure
10. customgave a crude product

ORD record

ord-619cd3de483541359c448755c2f21416

Source dataset

uspto-grants-1998_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05763437