Radiosynthesis of [<sup>18</sup>F]PBR111, a selective radioligand for imaging the translocator protein (18 kDa) with PET
作者:Frédéric Dollé、Françoise Hinnen、Annelaure Damont、Bertrand Kuhnast、Christopher Fookes、Tien Pham、Bertrand Tavitian、Andrew Katsifis
DOI:10.1002/jlcr.1559
日期:2008.11
PBR111 (2-(6-chloro-2-(4-(3-fluoropropoxy)phenyl)imidazo[1,2-a]pyridin-3-yl)-N,N-diethylacetamide) is a novel, reported, high-affinity and selective ligand for the translocator protein (18 kDa). PBR111 has been labelled with fluorine-18 (half-life: 109.8 min) using our Zymate-XP robotic system. The process involves (A) a simple one-step tosyloxy-for-fluorine nucleophilic aliphatic substitution (performed at 165°C for 5 min in DMSO using K[18F]F-Kryptofix®222 and 6.8–7.6 µmol of the corresponding tosylate as precursor for labelling) followed by (B) C-18 PrepSep cartridge pre-purification and (C) semi-preparative HPLC purification on a Waters Symmetry® C-18. Up to 4.8 GBq (130 mCi) of [18F]PBR111 could be obtained with specific radioactivities ranging from 74 to 148 GBq/µmol (2–4 Ci/µmol) in 75–80 min (HPLC purification and SepPak®-based formulation included), starting from a 37.0 GBq (1.0 Ci) [18F]fluoride batch. Overall non-decay-corrected isolated yields were 8–13% (13–21% decay-corrected). Copyright © 2008 John Wiley & Sons, Ltd.
PBR111(2-(6-氯-2-(4-(3-氟丙氧基)苯基)咪唑并[1,2-a]吡啶-3-基)-N,N-二乙基乙酰胺)是一种新颖的、已报道的、高亲和性和选择性的转运体蛋白(18 kDa)配体。我们使用 Zymate-XP 机器人系统对 PBR111 进行了氟-18 标记(半衰期:109.8 分钟)。该过程包括:(A) 简单的一步苯氧基-氟亲核脂肪族置换(使用 K[18F]F-Kryptofix®222 和 6.8-7.6 µmol 的相应对甲苯磺酸盐作为标记前体,在 DMSO 中于 165°C 进行 5 分钟),然后 (B) 在 C-18 PrepSep 滤芯上进行预纯化,(C) 在 Waters Symmetry® C-18 上进行半制备 HPLC 纯化。从 37.0 GBq(1.0 Ci)[18F]氟化物批次开始,在 75-80 分钟内(包括 HPLC 纯化和基于 SepPak® 的配方)可获得高达 4.8 GBq(130 mCi)的[18F]PBR111,其特定放射性活度范围为 74 至 148 GBq/µmol(2-4 Ci/µmol)。总体非衰变校正分离产率为 8-13%(衰变校正产率为 13-21%)。Copyright © 2008 John Wiley & Sons, Ltd. All Rights Reserved.