Methyl [1-(5-nitropyridin-2-yl)piperidin-4-yl]acetate → Methyl [1-(5-aminopyridin-2-yl)piperidine-4-yl]acetate

To a solution of (5′-nitro-3,4,5,6-tetrahydro-2H-[1,2′]bipyridinyl-4-yl)-acetic acid methyl ester (279 mg, 1 mmol) from above in a mixture of tetrahydrofuran (10 mL) and methanol (50 mL) was added 10% palladium on carbon (50 mg). The mixture was hydrogenated at 50 psi for 1 hr. The mixture was filtered and the solvents were evaporated to give (5′-amino-3,4,5,6-tetrahydro-2H-[1,2′]bipyridinyl-4-yl)-acetic acid methyl ester that was used in the next step without further purification.