O.NN.[C:4]([O:8][C:9]([N:11]1[CH2:16][CH2:15][N:14]([C:17]([CH2:26][N:27]2C(=O)C3C(=CC=CC=3)C2=O)([C:22]([O:24][CH3:25])=[O:23])[C:18]([O:20][CH3:21])=[O:19])[CH2:13][CH2:12]1)=[O:10])([CH3:7])([CH3:6])[CH3:5]>CO>[NH2:27][CH2:26][C:17]([N:14]1[CH2:13][CH2:12][N:11]([C:9]([O:8][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:10])[CH2:16][CH2:15]1)([C:18]([O:20][CH3:21])=[O:19])[C:22]([O:24][CH3:25])=[O:23]A solution of 2.9 ml (64 mmol) of hydrazine hydrate in 8 ml of methanol is added to a solution of 27.5 g (58 mmol) of dimethyl 2-(4-tert-butoxycarbonylpiperazin-1-yl)-2-(1,3-dioxo-1,3-dihydroisoindol-2-yl-methyl)malonate in 300 ml of methanol previously cooled to −5° C. The reaction medium is stirred from −5° C. to ambient temperature for 3 h. After evaporation and addition of 300 ml of water, the reaction medium is extracted with ethyl acetate. The organic phases are washed with a saturated aqueous solution of sodium hydrogen carbonate, dried over magnesium sulphate, filtered and evaporated. The residue obtained is purified by chromatography over silica gel eluted with an 8/2 heptane/ethyl acetate mixture then the polarity was increased to a 9/1 ethyl acetate/methanol mixture. 10 g (50%) of dimethyl 2-aminomethyl-2-(4-tert-butoxycarbonylpiperazin-1-yl)malonate are thus obtained in the form of a clear oil.
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