A mixture of 4,4-diphenyl-2-cyclopentenyl chloride (0.60 g), 4-diethylamino-1,1-dimethyl-2-butynylamine (0.79 g) and a catalytic amount of sodium iodide in acetone (5 ml) was refluxed for 8 hours. After being cooled, the solvent was removed off under reduced pressure and the residue was purified with column chromatography on silica gel with a mixture of chloroform and methanol as an eluent to give N-[4-diethylamino-1,1-dimethyl-2-butynyl]-4,4-diphenyl-2-cyclopentenylamine (0.54 g). The free amine obtained above was dissolved in chloroform, and to the solution was added hydrogen chloride in methanol (0.18 g/ml, 1 ml). The solution was evaporated in vacuo and triturated with a mixture of ethanol and isopropyl alcohol to give its hydrochloride (0.45 g).
