Design and synthesis of enantiopure<sup>18</sup>F-labelled [<sup>18</sup>F]trifluoromethyltryptophan from 2-halotryptophan derivatives via copper(I)-mediated [<sup>18</sup>F]trifluoromethylation and evaluation of its in vitro characterization for the serotonergic system imaging
作者:Ho Young Kim、Ji Youn Lee、Yun-Sang Lee、Jae Min Jeong
DOI:10.1002/jlcr.3772
日期:2019.7
We synthesized [18F]trifluoromethyl-l-tryptophan ([18F]CF3-l-Trp) using Cu(I)-mediated [18F]trifluoromethylation to image serotonergic system. Radiochemical yield was 6 ± 1.5% (n = 9), and radiochemical purity was over 99%. The molar activity was 0.44 to 0.76 GBq/μmol. [18F]CF3-l-Trp was stable for up to 6 hours in mouse and human sera at 37°C. Protein-binding was 0.26 ± 0.03% and 0.34 ± 0.02% in human and mouse serum at 60 minutes, respectively. In conclusion, enantiopure [18F]CF3-l-Trp was synthesized as a feasible imaging agent for the serotonergic system.
我们利用 Cu(I)-mediated [18F]trifluoromethyl-l-tryptophan ([18F]CF3-l-Trp)三氟甲基化反应合成了[18F]三氟甲基-l-色氨酸([18F]CF3-l-Trp),以对血清素能系统进行成像。放射化学收率为 6 ± 1.5%(n = 9),放射化学纯度超过 99%。摩尔活性为 0.44 至 0.76 GBq/μmol。在 37°C 的温度下,[18F]CF3-l-Trp 在小鼠和人类血清中的稳定性可达 6 小时。60 分钟后,人和小鼠血清中的蛋白结合率分别为 0.26 ± 0.03% 和 0.34 ± 0.02%。总之,合成的对映体纯[18F]CF3-l-Trp是一种可行的血清素能系统成像剂。