Synthesis and evaluation of p-iodo- phentermine (Ip) as a brain perfusion imaging agent

P-(¹²³I and¹³¹I) iodo α,α-dimethylphenethylamine (p-iodophentermine, IP) as the a-methyl- ated analogue of iodoamphetamine has been prepared. It is hoped that this methyl substitution will increase the lipophilicity of the agent, enhance resistance to metabolism by monoamine oxidase, and will result in increased initial uptake and slower washout from the brain as compared to N-isopropyl-p-(¹²³I) iodoamphetamine. IP was prepared by diazo- tization of p-aminophentermine followed by decomposition of the diazonium salt with KI. Radioiodinated IP was prepared either by the solid-phase isotopic exchange reaction or by decomposition of the piperidinotriazene derivative with a radiochemical yield of 40-60%. Biodistribution of¹³¹I-IP in rats showed brain uptake in the range of 1.7% dose g^-1at 5,30 and 60 min. Imaging studies with¹²³I-EP in dogs showed high brain extraction and slow washout of activity.