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To a solution of N-(2-adamantyl)spiro[indoline-3,4′-piperidine]-1′-carboxamide (20 mg, 0.06 mmol) and succinic anhydride (12 mg, 0.12 mmol) in CH2Cl2 (5 mL) was added TEA. After stirred for 2 h at rt the solvent was removed to give 4-(1′-(2-adamantylcarbamoyl)spiro[indoline-3,4′-piperidine]-1-yl)-4-oxobutanoic acid (20 mg, 74%). LC-MS Method 5 tR=3.6 min, m/z=953.1; 1H NMR (CD3OD) δ=1.69 (d, 2H), 1.75 (d, 2H), 1.80-1.99 (m, 11H), 2.00-2.10 (m, 5H), 2.20 (s, 2H), 2.60-2.70 (m, 2H), 2.80-2.90 (m, 2H), 3.06-3.18 (m, 2H), 3.93 (s, 1H), 4.10-4.19 (m, 2H), 4.20 (s, 2H), 5.90 (d, 1H), 7.10 (m, 1H), 7.19-7.28 (m, 2H), 8.16 (d, 1H).

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