tert-Butyl 4-(6-aminopyridin-3-yl)piperazine-1-carboxylate → HCID 11342019, compound

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8-Cyclopentyl-6-(2-ethoxy-ethyl)-2-methanesulfinyl-8H-pyrido[2,3-d]pyrimidin-7-one (1.0 g 2.86 mmol) and 4-(6-amino-pyridin-3-yl)-piperazine-1-carboxylic acid tert-butyl ester (1.10 g, 3.95 mmol) were heated to reflux in toluene (10 mL) for 16 hours. The mixture was cooled to room temperature and purified by silica gel chromatography to give 4-{6-[8-cyclopentyl-6-(2-ethoxy-ethyl)-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidin-2-ylamino]-pyridin-3-yl}-piperazine-1-carboxylic acid tert-butyl ester as an orange solid (0.328 g, 20.4%). 1H NMR δ(400 MHz, CDCl3) 8.54 (s, 1H), 8.26 (d, J=9.0 Hz, 1H), 7.98 (d, J=2.9 Hz, 1H), 7.45 (s, 1H), 7.38 (dd, J=2.9, 9.3 Hz, 1H), 5.90 (m, 1H), 3.70 (t, J=6.3, 1H), 3.61 (m, 4H), 3.51 (q, J=7.1, 1H), 3.11 (m, 4H), 2.84 (t, J=5.9, 1H), 2.33 (m, 2H), 2.08 (m, 2H), 1.87 (m, 2H), 1.69 (m, 2H), 1.48 (s, 9H), 1.19 (t, J=7.1, 1H).

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