Cationic imidazolium polymer monoliths for efficient solvent exchange, activation and fluorination on a continuous flow system
作者:Rehana Ismail、Jonathan Irribaren、Muhammad Rashed Javed、Ariella Machness、R. Michael van Dam、Pei Yuin Keng
DOI:10.1039/c4ra04064c
日期:——
Polystyrene-imidazolium (PS-Im+Cl−) monolith was synthesized within a flow-through microfluidic chip and Teflon tubing for activating [18F]fluoride ions. The [18F]fluoride ions were trapped on the PS-Im+ monolith and were subsequently released with various phase-transfer catalysts (PTC) and carbonate or bicarbonate bases in microliter volumes of organic solvents containing 0.5% of water. The activated [18F]fluoride complex released from the PS-Im+ monolith was used to fluorinate various known PET probe precursors with diverse reactivity in a subsequent flow-through microfluidic chip without performing additional azeotropic distillation. The fluorination yields under the optimized condition for the protected [18F]FDG, protected [18F]FLT, 4-[18F]fluoroethylbenzoate, and [18F]fallypride were 93%, 96%, 77% and 73%, respectively. This method, utilizing the PS-Im+ monolith on a flow through microfluidic platform, enables the entire fluorine-18 radiochemistry to be performed on a flow-through microfluidic device within a shorter synthesis time and with fluorination efficiency that is comparable to or higher than conventional means.
聚苯乙烯-咪唑阳离子(PS-Im+Cl−)单体在流动微流控芯片和特氟龙管中合成,用于活化[18F]氟离子。[18F]氟离子被捕获在PS-Im+单体上,随后通过各种相转移催化剂(PTC)和碳酸盐或重碳酸盐碱基在含有0.5%水的有机溶剂的微升体积中释放。从PS-Im+单体释放的活化[18F]氟化物复合物用于在后续的流动微流控芯片中氟化多种已知的正电子发射断层扫描(PET)探针前体,这些前体具有不同的反应性,而不需进行额外的共沸蒸馏。在优化条件下,保护的[18F]FDG、保护的[18F]FLT、4-[18F]氟乙基苯酸酯和[18F]法利哌的氟化产率分别为93%、96%、77%和73%。该方法利用流动微流控平台上的PS-Im+单体,使整个氟-18放射化学过程能够在流动微流控装置中完成,合成时间更短,氟化效率与传统方法相比相当或更高。