High‐yielding, automated radiosynthesis of [
<sup>11</sup>
C]martinostat using [
<sup>11</sup>
C]methyl triflate
作者:Robert Hopewell、Dean Jolly、Qian Ying Li、Karen Ross、I‐Huang Tsai、Monica Lacatus‐Samoila、Jean‐Paul Soucy、Eliane Kobayashi、Pedro Rosa‐Neto、Gassan Massarweh
DOI:10.1002/jlcr.3968
日期:2022.5.30
Histone deacetylases (HDACs) mediate epigenetic mechanisms implicated in a broad range of central nervous system dysfunction, including neurodegenerative diseases and neuropsychiatric disorders. [11C]Martinostat allows in vivo quantification of class I/IIb HDACs and may be useful for the quantification of drug–occupancy relationship, facilitating drug development for disease modifying therapies. The present study reports a radiosynthesis of [11C]martinostat using [11C]methyl triflate in ethanol, as opposed to the originally described synthesis using [11C]methyl iodide and DMSO. [11C]Methyl triflate is trapped in a solution of 2 mg of precursor 1 dissolved in anhydrous ethanol (400 μl), reacted at ambient temperature for 5 min and purified by high-performance liquid chromatography; 1.5–1.8 GBq (41–48 mCi; n = 3) of formulated [11C]martinostat was obtained from solid-phase extraction using a hydrophilic–lipophilic cartridge in a radiochemical yield of 11.4% ± 1.1% (nondecay corrected to trapped [11C]MeI), with a molar activity of 369 ± 53 GBq/μmol (9.97 ± 1.3 Ci/μmol) at the end of synthesis (40 min) and validated for human use. This methodology was used at our production site to produce [11C]martinostat in sufficient quantities of activity to scan humans, including losses incurred from decay during pre-release quality control testing.
组蛋白去乙酰化酶(HDACs)介导的表观遗传机制与多种中枢神经系统功能障碍有关,包括神经退行性疾病和神经精神疾病。[11C]马汀诺司他(Martinostat)可以对 I/IIb 类 HDAC 进行体内定量,并可用于药物占位关系的定量,从而促进改变疾病疗法的药物开发。本研究报告了在乙醇中使用[11C]三氟甲基酯对[11C]马丁诺司特的放射合成,而不是最初描述的使用[11C]碘甲烷和二甲基亚砜的合成。[11C]三氟甲基甲烷被截留在 2 毫克前体 1 溶于无水乙醇(400 微升)的溶液中,在环境温度下反应 5 分钟,然后用高效液相色谱法纯化;1.5-1.8 GBq (41-48 mCi; n = 3)的配制[11C]马汀诺司特,使用亲水亲脂滤芯进行固相萃取,放射化学收率为 11.4% ± 1.1%(未衰减校正为截留[11C]MeI),合成结束时(40 分钟)摩尔活性为 369 ± 53 GBq/μmol (9.97 ± 1.3 Ci/μmol),并通过人体使用验证。我们的生产基地采用这种方法生产出的[11C]马替诺司他具有足够的活性,可以对人体进行扫描,包括在释放前质量控制测试过程中因衰变造成的损失。