[F:1][C:2]1[CH:17]=[CH:16][C:5]([C:6]([N:8]2[CH2:12][CH2:11][CH:10]([C:13]#[N:14])[C:9]2=[O:15])=[O:7])=[CH:4][CH:3]=1.[H-].[Na+].I[CH2:21][CH3:22].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>CN(C=O)C>[CH2:21]([C:10]1([C:13]#[N:14])[CH2:11][CH2:12][N:8]([C:6](=[O:7])[C:5]2[CH:16]=[CH:17][C:2]([F:1])=[CH:3][CH:4]=2)[C:9]1=[O:15])[CH3:22]To a solution of 1-(4-fluorobenzoyl)-2-oxopyrrolidine-3-carbonitrile (25 g) in DMF (215 mL) was added a sodium hydride 60% dispersion in mineral oil (6.5 g) under ice-cooling. The reaction mixture was stirred under ice-cooling for 1 hr, and iodoethane (17 mL) was added slowly thereto. The reaction mixture was stirred under ice-cooling for 2 hr, and poured into 10% aqueous citric acid solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (23 g).
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