A mixture of 5-[4-(1-cyclohexyl-4-piperidyl)phenyl]-1,3,4-thiadiazol-2-amine trifluoroacetate (0.78 g) and ethyl 4-(bromoacetyl)benzoate (0.6 g) in ethanol (15 ml) was stirred for 5 hours at 80° C. After being cooled to room temperature, the reaction mixture was poured into isopropyl ether. The resulting precipitate was collected by filtration, washed with isopropyl ether and added to a solution of trifluoroacetic acid (1.5 ml) in xylene (15 ml). Then a mixture was stirred for 3 hours at 130° C. After being cooled to room temperature, the reaction mixture was poured into isopropyl ether. The resulting precipitate was collected by filtration and washed with isopropyl ether to give ethyl 4-[2-[4-(1-cyclohexyl-4-piperidyl)phenyl]imidazo[2,1-b][1,3,4]thiadiazol-6-yl]benzoate trifluroacetate (0.45 g).
