Sodium iodide (54 mg) and IPEA (0.05 mL) were added to a DME solution (2 mL) of (E)-1-[(1S)-1-(4-fluorophenyl)ethyl]-3-[3-methoxy-4-(4-methyl-1H-imidazol-1-yl)benzylidene]piperidin-2-one (CAS Registry No. 870843-42-8, 100 mg) and chloromethyl acetate (0.03 mL), and the resulting reaction solution was stirred at 80° C. for 1 hr. The reaction solution was allowed to cool to room temperature, and the precipitated solid was collected by filtration. The obtained solid was washed with diethylether and dried in air to give 70 mg of the title compound. The physical property values of this compound were as follows:
