Rapid synthesis of maleimide functionalized fluorine-18 labeled prosthetic group using “radio-fluorination on the Sep-Pak” method
作者:Falguni Basuli、Xiang Zhang、Elaine M. Jagoda、Peter L. Choyke、Rolf E. Swenson
DOI:10.1002/jlcr.3623
日期:2018.6.30
Following our recently published fluorine-18 labeling method, “Radio-fluorination on the Sep-Pak”, we have successfully synthesized 6-[18F]fluoronicotinaldehyde by passing a solution (1:4 acetonitrile: t-butanol) of its quaternary ammonium salt precursor, 6-(N,N,N-trimethylamino)nicotinaldehyde trifluoromethanesulfonate (2), through a fluorine-18 containing anion exchange cartridge (PS-HCO3). Over 80% radiochemical conversion was observed using 10 mg of precursor within 1 minute. The [18F]fluoronicotinaldehyde ([18F]5) was then conjugated with 1-(6-(aminooxy)hexyl)-1H-pyrrole-2,5-dione to prepare the fluorine-18 labeled maleimide functionalized prosthetic group, 6-[18F]fluoronicotinaldehyde O-(6-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)hexyl) oxime, 6-[18F]FPyMHO ([18F]6). The current Sep-Pak method not only improves the overall radiochemical yield (50 ± 9%, decay-corrected, n = 9) but also significantly reduces the synthesis time (from 60-90 minutes to 30 minutes) when compared with literature methods for the synthesis of similar prosthetic groups.
遵循我们最近发布的氟 18 标记方法“Sep-Pak 上的放射氟化”,我们通过季铵盐溶液(1:4 乙腈:叔丁醇)成功合成了 6-[18F]氟烟醛前体 6-(N,N,N-三甲氨基)烟醛三氟甲磺酸盐 (2),通过含氟 18 的阴离子交换柱 (PS-HCO3)。使用 10 毫克前体在 1 分钟内观察到超过 80% 的放射化学转化。然后将[18F]氟烟醛([18F]5)与1-(6-(氨基氧基)己基)-1H-吡咯-2,5-二酮缀合以制备氟18标记的马来酰亚胺官能化辅基6-[ 18F]氟烟醛O-(6-(2,5-二氧代-2,5-二氢-1H-吡咯-1-基)己基)肟,6-[18F]FPyMHO ([18F]6)。与文献方法相比,当前的 Sep-Pak 方法不仅提高了总体放射化学产率(50 ± 9%,衰减校正,n = 9),而且还显着缩短了合成时间(从 60-90 分钟缩短到 30 分钟)。相似辅基的合成。