The reactions of beta-piperidinopropionamidoxime with substituted benzoyl chlorides afforded O-benzoylation products, which underwent cyclization to form 5-phenyl-3-(beta-piperidino)ethyl-1,2,4-oxadiazoles upon heating in dimethylformamide in the presence of molecular sieves at 60 degreesC for 1-2.5 h. Heating of O-benzoyl-beta-piperidinopropionamidoxime in dimethylformamide in the presence of K2CO3 at 85 degreesC for 4 h afforded a mixture of 5-phenyl-3-(beta-piperidino)ethyl-1,2,4-oxadiazole, benzoic acid, and N-(beta-piperidino)ethylurea.