A delta opioid receptor antagonist, N1′-methylnaltrindole (MeNTI), has been labeled with carbon-11. The precursor for radiolabeling was prepared in 71% yield by benzylation of the phenolic moiety of naltrindole. Alkylation of the indole nitrogen using [11C]iodomethane and aqueous tetra(n-butyl)ammonium hydroxide at 80 °C in dimethylformamide followed by hydrogenolysis (H2, 10% Pd-C) of the benzyl protecting group gave [11C]MeNTI. The average (n = 10) time for radiosynthesis, HPLC purification and formulation was 24 min from end-of-bombardment. [11C]MeNTI of high radiochemical purity was obtained at end-of-synthesis with an average specific activity of 2050 mCi/μmol and radiochemical yield, based on [11C]iodomethane, of 6%.
一种δ类阿片受体拮抗剂--N1′-甲基纳曲
吲哚(MeNTI)已被碳-11标记。放射性标记的前体是通过苄基化纳曲
吲哚的
酚基制备的,收率为 71%。使用[11C]
碘甲烷和氢氧化四(正丁基)
铵水溶液在二甲基甲酰胺中于 80 °C 下对
吲哚氮进行烷基化,然后对苄基保护基团进行氢解(H2,10% Pd-C),得到[11C]MeNTI。放射性合成、高效
液相色谱纯化和配制的平均时间(n = 10)为 24 分钟(从爆炸结束算起)。合成结束时获得了放射
化学纯度很高的[11C]MeNTI,其平均比活度为 2050 mCi/μmol,放射
化学收率(基于[11C]
碘甲烷)为 6%。