[H-].[Na+].[N+:3]([C:6]1[CH:11]=[CH:10][C:9]([C:12]23[CH2:18][CH:16]([CH2:17]2)[C:15](=[O:19])[NH:14][C:13]3=[O:20])=[CH:8][CH:7]=1)([O-:5])=[O:4].[CH2:21](I)[CH2:22][CH2:23][CH2:24][CH3:25]>CN(C)C=O>[N+:3]([C:6]1[CH:7]=[CH:8][C:9]([C:12]23[CH2:17][CH:16]([CH2:18]2)[C:15](=[O:19])[N:14]([CH2:21][CH2:22][CH2:23][CH2:24][CH3:25])[C:13]3=[O:20])=[CH:10][CH:11]=1)([O-:5])=[O:4]0.36 g of sodium hydride is added to a solution of 2.46 g of 1-(4-nitrophenyl)-3-azabicyclo[3.1.1]heptane-2,4-dione in 25 ml of N,N-dimethylformamide and the whole is stirred at room temperature for 30 minutes. 2.96 g of n-pentyl iodide dissolved in 10 ml of N,N-dimethylformamide are then added dropwise thereto. When the reaction is complete, the reaction mixture is freed of N,N-dimethylformamide. The residue is partitioned between ethyl acetate and water, and the organic phase is dried over magnesium sulphate and, after concentration by evaporation, the product is obtained having a melting point of 75°-79°.
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