Diisopropylethylamine → (R)-1-(4-(5,6-dihydropyridin-1(2H)-yl)piperidin-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 1-(piperidin-4-yl)-1,2,3,6-tetrahydropyridine (75.7 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% methanol/dichloromethane and passed through a basic alumina column to give 35.9 mg (53%) as a white powder. 1H-NMR (CD3OD, 500 MHz) δ −0.35-0.15 (m, 0.7H), 0.60-0.93 (m, 1H), 1.15-2.20 (m, 11H), 2.30-3.25 (m, 11H), 3.75-4.58 (m, 4H), 5.35-5.75 (m, 3H), 7.01-7.14 (m, 1H), 7.18 (m, 1H), 7.28 (m, 1H), 7.36-7.50 (m, 2H), 7.53-7.73 (m, 2H), 7.90-8.01 (m, 1H). Mass spec.: 623.33 (MH)+.

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