2-2-[4-(4-[18F]-Fluorobenzyl)piperazin-1-yl]-2-oxoethyl}isoindolin-1-one ([18F]MEL054), is a new potent indolinone-based melanin binder designed to target melanotic tumours. [18F]MEL054 was prepared by an automated two-step radiosynthesis, comprising of the preparation of 4-[18F]fluorobenzaldehyde from 4-formyl-N,N,N-trimethylanilinium triflate, followed by reductive alkylation with 2-(2-oxo-2-piperazin-1-ylethyl)isoindolin-1-one. 4-[18F]Fluorobenzaldehyde was prepared on a GE TRACERlab FXFN module in 68 ± 8 % radiochemical yield (RCY, non-decay corrected), purified by a Sep-Pak Plus C18 cartridge and eluted into the reactor of an in-house modified Nuclear Interface [18F]FDG synthesis module for the subsequent reductive alkylation reaction. HPLC purification produced [18F]MEL054 in a collected RCY of 34 ± 9 % (non-decay corrected), the total preparation time (including Sep-Pak Plus C18 and HPLC purification) did not exceed 105 min. The radiochemical purity of [18F]MEL054 was greater than 99 % with a specific radioactivity of 71–119 GBq μmol–1 and [18F]MEL054 remained stable in saline solution (>98 %) after 3 h.
2-2-[4-(4-[18F]-氟苄基)哌嗪-1-基]-2-氧代乙基}异吲哚啉-1-酮([18F]MEL054)是一种新的强效吲哚啉酮基黑色素粘合剂,设计用于靶向黑色素肿瘤。[18F]MEL054是通过两步放射合成法自动制备的,包括从4-甲酰基-N,N,N-三甲基苯胺三酸盐制备4-[18F]氟苯甲醛,然后与2-(2-氧代-2-哌嗪-1-乙基)异吲哚啉-1-酮进行还原烷基化反应。4-[18F]Fluorobenzaldehyde 是在 GE TRACERlab FXFN 模块上制备的,放射化学收率(RCY,未衰变校正)为 68 ± 8%,经 Sep-Pak Plus C18 滤芯纯化后洗脱到内部改进的 Nuclear Interface [18F]FDG 合成模块的反应器中,用于随后的还原烷基化反应。HPLC 纯化产生的[18F]MEL054 的收集 RCY 为 34 ± 9 %(非衰变校正),总制备时间(包括 Sep-Pak Plus C18 和 HPLC 纯化)不超过 105 分钟。[18F]MEL054的放射化学纯度大于99%,比放射性为71-119 GBq μmol-1,3小时后[18F]MEL054在生理盐水中保持稳定(98%)。