Potassium Carbonate → 2-[3-(4-Methoxy-1-piperidinyl)propyl]-1H-isoindole-1,3(2H)-dione

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A suspension of 4-methoxypiperidine (286) (4.1 g, 35.3 mmol), N-(3-bromopropyl)phthalimide (9.0 g, 33.6 mmol) and K2CO3 (7.0 g, 50.4 mmol) in DMF (80 mL) was stirred at 50° C. for 16 h. The solution was cooled, the solvent evaporated and the residue partitioned between water (150 mL) and EtOAc (150 mL). The organic fraction was washed with water (2×50 mL) and brine (50 mL), dried and the solvent evaporated. The residue was purified by chromatography, eluting with a gradient (0-5%) of MeOH/DCM, to give phthalimide 305 (6.0 g, 59%) as a white solid: 1H NMR δ 7.81-7.86 (m, 2H, Harom), 7.67-7.73 (m, 2H, Harom), 3.75-3.79 (t, J=7.0 Hz, 2H, CH2N), 3.28 (s, 3H, OCH3), 3.09-3.17 (m, 1H, CHO), 2.63-2.70 (m, 2H, CH2N), 2.39 (t, J=7.0 Hz, 2H, CH2N), 2.01-2.08 (m, 2H, CH2N), 1.85 (p, J=7.0 Hz, 2H, CH2), 1.74-1.81 (m, 2H, CH2), 1.37-1.46 (m, 2H, CH2). Anal. calcd for C17H22N2O3: C, 67.5; H, 7.3; N, 9.3. Found: C, 67.3; H, 7.4; N, 9.3%.

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