Sodium Iodide → 5-(3,4-Difluorobenzyl)-2,3-dihydro-4-methoxycarbonyl-1-(5-(4-phenylpiperidin-1-yl)pent-1-yl)-2(1H)-imidazolone

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Reaction Steps

To a stirred solution of 1-(5-bromopent-1-yl)-5-(3,4-difluorobenzyl)-2,3-dihydro-4-methoxycarbonyl-2(1H)-imidazolone (0.167 g, 0.4 mmol) in dioxane (20 mL) was added 4-phenylpiperidine (0.128 g, 0.800 mmol), potassium carbonate (0.165 g, 1.20 mmol) and sodium iodide (0.358 g, 2.38 mmol), and the solution refluxed for 24 hours. The reaction mixture was cooled to room temperature, concentrated and partitioned between ethyl acetate (25 mL) and water (5 mL) . The organic layer was dried over sodium sulfate, filtered and concentrated. The crude product was purified by column chromatography (ethyl acetate: methanol, 4.5:0.5) to yield 0.062 g (31%) of the required product as a colorless oil; 1H-NMR (CDCl3) δ1.25-2.44 (m, 13H), 3.13 (d, J=11.4 Hz, 2H), 3.26 (d, J=10.5 Hz, 2H), 3.53 (t, J=7.7 Hz, 2H), 3.85 (s, 3H), 4.10-4.12 (m, 1H), 4.21 (s, 2H), 6.90-7.30 (m, 8H). Hydrochloride salt (recrystallized from ether): yellow solid; m.p. 130-132° C. Analysis calculated for C28H34ClF2N3O3.0.80 CH2Cl2 : C, 57.46; H, 5.96; N, 6.98. Found: C, 57.18; H, 6.33; N, 6.76.

Provenance & Evidence