1-(4-Fluorophenyl)piperazine → (R)-1-(4-(4-fluorophenyl)piperazin-1-yl)-3-(7-methyl-1H-indazol-5-yl)-1-oxopropan-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 N-(4-fluorophenyl)piperazine (38.0 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. The reaction was concentrated and purified by column chromatography (95:5:1 to 90:10:1 dichloromethane/methanol/triethylamine). The resulting residue was dissolved in 5% methanoudichloromethane and passed through a basic alumina column to give 71.2 mg (quant.) as a white powder. 1H-NMR (CD3OD, 500 MHz) δ 1.25-1.75 (m, 2H), 1.75-2.25 (m, 9H), 2.51 (s, 3H), 2.75 (m, 1H), 2.75-3.30 (m, 13H), 3.48 (m, 3H), 3.80 (m, 1H), 4.05-4.50 (m, 2H), 5.55 (dd, J=7.6, 7.3, 1H), 6.68 (m, 2H), 6.91 (m, 1H), 7.11 (s, 1H), 7.21 (dd, J=7.9, 7.3, 1H), 7.32 (d, J=8.2, 1H), 7.47 (dd, J=7.9, 7.3, 1H), 7.51 (m, 1.5H), 7.61 (d, J=7.6, 1H), 7.67 (bs, 0.5H), 8.00 (s, 1H). Mass spec.: 637.28 (MH)+.

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