[CH3:1][C:2]([C:8]1[CH:13]=[CH:12][C:11]([N+:14]([O-])=O)=[CH:10][CH:9]=1)([CH3:7])[C:3]([O:5][CH3:6])=[O:4].NN>C(O)C.[Pd]>[CH3:6][O:5][C:3](=[O:4])[C:2]([C:8]1[CH:9]=[CH:10][C:11]([NH2:14])=[CH:12][CH:13]=1)([CH3:7])[CH3:1]To a solution of 4.68 g of methyl 2-methyl-2-(4-nitrophenyl)-propanoate in 200 mL of ethanol, under argon, is added 0.5 g of palladium-on-charcoal (10%). The suspension is heated at 55° C. and 28 mL of hydrazine are added dropwise at this same temperature, and heating is continued for 3 hours at 55° C. After cooling, the reaction medium is filtered through Celite and the filtrate is concentrated under reduced pressure to give 4 g of 2-(4-aminophenyl)-2-methylpropionic acid methyl ester in the form of a colourless oil, the characteristics of which are as follows:
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