1-(4-Pyridyl)piperazine → (R)-3-(7-methyl-1H-indazol-5-yl)-1-oxo-1-(4-(pyridin-4-yl)piperazin-1-yl)propan-2-yl 4-(2-oxo-1,2-dihydroquinolin-3-yl)piperidine-1-carboxylate

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To a solution of (R)-3-(7-methyl-1H-indazol-5-yl)-2-(4-(2-oxo-1,2-dihydroquinolin-3-yl)piperidine-1-carbonyloxy)propanoic acid (50 mg, 0.11 mmol), diisopropylethylamine (37 μL, 0.21 mmol), and 1-(4-pyridyl)piperazine (34.4 mg, 2.0 equiv) in dimethylformamide (0.50 mL) and dichloromethane (0.50 mL) at 0° C. was added PyBOP® (57.6 mg, 0.11 mmol). The reaction was stirred at 0° C. for 4 h, was concentrated, and purified by column chromatography (95:5:1 to 90:10:1 dichloromethane/methanol/triethylamine). The resulting residue was dissolved in 5% methanol/dichloromethane and passed through a basic alumina column to give 53.8 mg (80%) as a white powder. 1H-NMR (CD3OD, 500 MHz) δ 1.25-2.00 (m, 4H), 2.51 (s, 3H), 2.67 (bs, 1H), 2.80-3.31 (m, 7H), 3.35-3.83 (m, 5H), 4.05-4.49 (m, 2H), 5.52 (dd, J=7.6, 7.3, 1H), 6.64 (bs, 2H), 7.12 (s, 11H), 7.22 (dd, J=7.0, 7.0, 1H), 7.32 (d, J=8.2, 1H), 7.47 (m, 1H), 7.52 (m, 1.5H), 7.62 (d, J=7.0, 11H), 7.69 (bs, 0.5H), 7.99 (s, 1H), 8.10 (m, 2H). Mass spec.: 620.28 (MH)+.

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