[CH2:1]([O:3][C:4](=[O:18])[CH:5]([CH2:8][C:9]1[CH:14]=[CH:13][C:12]([N+:15]([O-])=O)=[CH:11][CH:10]=1)[CH2:6][CH3:7])[CH3:2].[H][H]>C(OCC)(=O)C.[Pd]>[CH2:1]([O:3][C:4](=[O:18])[CH:5]([CH2:8][C:9]1[CH:10]=[CH:11][C:12]([NH2:15])=[CH:13][CH:14]=1)[CH2:6][CH3:7])[CH3:2]28 g of 2-(p-nitrobenzyl)-butyric acid ethyl ester are dissolved in 200 ml ethyl acetate. The solution is added with 1 g of 10% Pd/C and hydrogenated in a Parr apparatus until complete absorption of hydrogen. After filtering and evaporation from solvent about 25 g of product are obtained as a sufficiently pure oil for the successive reactions.
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