Potassium Iodide → 2H-Benzimidazol-2-one, 1,3-dihydro-1-(1-(4,4-bis(4-fluorophenyl)cyclohexyl)-4-piperidinyl)-5-chloro-

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Reaction Steps

A mixture of 11 g of 4,4-bis(p-fluorophenyl)cyclohexyl tosylate, 6 g of 1-(4-piperidyl)-5-chloro-2-benzimidazolinone, 3.5 g of potassium carbonate, 4.1 g of potassium iodide and 80 ml of dimethylformamide is stirred at 70°-80° C for 64 hours. The reaction mixture is poured into water, ether is added to the separated semi-solid, and the whole is stirred for 30 minutes. The substance insoluble in water and ether is collected by filtration, washed with ether and dried. The obtained crystals are dissolved in a mixture of chloroform and methanol (9:1), and the solution is concentrated to some degree and cooled. The precipitated crystals are collected by filtration and purified in the same manner to give 1-[1-(4,4-bis(p-fluorophenyl)cyclohexyl)-4-piperidyl]-5-chloro-2-benzimidazolinone as white crystals, melting at 279°-284° C.

Provenance & Evidence