4,6-Dimethoxy-2-(4-methoxypiperidin-1-yl)-5-nitropyrimidine → 4,6-Dimethoxy-2-(4-methoxypiperidin-1-yl)pyrimidin-5-amine

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Reaction Steps

To a 1 L Atlantis reactor, under nitrogen, was added 20% palladium on carbon (6.16 g, 5.79 mmol, 15% by weight), 4,6-dimethoxy-2-(4-methoxypiperidin-1-yl)-5-nitropyrimidine (41.1 g, 137.8 mmol) and methanol (390 mL). The reactor was sealed and purged with nitrogen (3×) and then hydrogen (3×). The mixture was hydrogenated at 50 psi (H2) for 3 h. After purging with nitrogen, the catalyst was removed by filtration, and the filter cake was rinsed with additional methanol (150 mL). The filtrate was concentrated to afford 40.25 g of 4,6-dimethoxy-2-(4-methoxypiperidin-1-yl)pyrimidin-5-amine as a viscous orange oil that was used without further purification. 1H NMR (400 MHz, CDCI3) δ 4.17-4.29 (m, 2H) 3.92 (s, 6H) 3.39 (s, 3H) 3.34-3.47 (m, 1H) 3.19 (ddd, J=13.0, 9.0, 3.0 Hz, 2H) 2.76 (br. s., 2H) 1.87-2.00 (m, 1H) 1.43-1.68 (m, 2H). LCMS m/z=269.1 (M+1).

Provenance & Evidence