反应详情

6.2 742 mg (3.00 mmol) of ethyl 2-ethoxy-1,2-dihydroquinoline-1-carboxylate (EEDQ) are added to a suspension of 459 mg (2.00 mmol) of Boc-4-keto-D-proline and 372 mg (2.00 mmol) of 1-(4-aminophenyl)-1H-pyridin-2-one in 25 ml of toluene, and the mixture is stirred at room temperature for 18 hours. 200 ml of tert-butyl methyl ether are added, and the precipitate formed is filtered off. 200 ml of petroleum ether are added to the filtrate, and the resultant precipitate is filtered off, giving tert-butyl (R)-4-oxo-2-[4-(2-oxo-2H-pyridin-1-yl)phenylcarbamoyl]pyrrolidine-1-carboxylate as a brownish solid; ESI 398.

1. customthe precipitate formed
2. filtrationis filtered off
3. addition200 ml of petroleum ether are added to the filtrate
4. filtrationthe resultant precipitate is filtered off