Potassium Iodide → 1-[3-[4-(1,4-Benzodioxan-5-yl)-1-piperazinyl]-1-propyl]-3-phenyl-2-imidazolidinone, hydrochloride

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A mixture of 1-(1,4-benzodioxan-5-yl)-piperazine (1.5 g), 1-(3-chloro-1-propyl)-3-phenyl-2-imidazolidinone (1.4 g), potassium carbonate (3 g), and potassium iodide (0.1 g) in methyl isobutyl ketone was refluxed for 20 h. Filtration and removal of solvent in vacuo gave a viscous oil which was separated by column chromatography (silica gel, eluent: ethyl acetate/methanol/triethylamine=15:4:1). The title compound was isolated as an oil which crystallized as the hydrochloride salt from acetone by addition of hydrochloric acid. Yield: 1.9 g, mp: 229-32° C. 1H NMR (δ, DMSO): 1.95-2.15 (m, 2H), 3.00-3.25 (m, 6H), 3.30 (t, 2H), 3.40-3.65 (m, 4H), 3.70-4.00 (m, 4H), 4.15-4.30 (m, 4H), 6.45-6.70 (m, 2H), 6.75 (t, 1H), 7.00 (t, 1H), 7.30 (t, 2H), 7.60 (d, 2H), 11.30 (b, 1H).

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