Methyl 4-(4-nitrophenyl)butanoate → Methyl 4-aminobenzenebutanoate

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A mixture of methyl 4-(4-nitrophenyl)butanoate and methyl 4-(2-nitrophenyl)butanoate (2.24 g, 10.03 mmol) and 0.2 g of 10% Pd/C in 40 mL of methanol was vigorously stirred under hydrogen air. The mixture was stirred for 4 h at room temperature (monitored by TLC), and filtered through Celite. The solvent was evaporated. The residue was purified by chromatography to give the title compound (0.80 g, 41%): NMR (400 MHz in CDCl3, Bruker AVANCE-400): δ 1.89 (m, 2H, CH2), 2.31 (t, 2H, CH2—CH2—COOMe), 2.53 (t, 2H, CH2), 3.58 (br, 2H, NH2), 3.65 (s, 3H, OMe), 6.61 (d, 2H, J=3.5 Hz, Ar—H), 6.95 (d, 2H, J=3.4 Hz).

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