High‐yield synthesis of a tau PET radioligand and its nonradioactive ligand using an alternative protection and deprotection strategy
作者:Hyunjung Kim、Yearn Seong Choe
DOI:10.1002/jlcr.3894
日期:2021.4
two‐step radiochemical synthesis followed by HPLC purification gave [18F]1 in high decay‐corrected radiochemical yield (54‐60%). The RCC of [18F]fluoride to [18F]1 in our two‐step synthesis method was similar to that in a one‐step radiofluorination reaction of a tert‐butoxycarbonyl (BOC)‐protected precursor 10 that proceeds with concomitant thermal deprotection of the BOC group. Taken together, the results
最近开发的 tau 成像放射性药物在人脑中富含 tau 蛋白的区域显示出特异性摄取,而没有脱靶结合。这些放射性药物及其非放射性参考配体通常以低(放射性)化学产率获得。在本研究中,我们研究了18 F-RO948 ([ 18 F] 1 ) 及其非放射性配体 ( 1 )的高产合成。配体1通过 9-(4-methoxybenzyl)-9 H -pyrrolo[2,3-b:4,5-c']dipyridin-2-yl trifluoromethanesulfonate ( 3 ) 和 2之间的 Suzuki-Miyaura 偶联反应合成-氟-5-(4,4,5,5-四甲基-1,3,2-二氧硼杂环戊烷-2-基)吡啶( 4),然后用硝酸铈铵 (CAN) 氧化去除对甲氧基苄基 (PMB) 基团。这个两步反应以 55.8% 的收率得到1。[ 18 F] 1的前体由3和 2-硝基-5-(4,4,5,5-四甲基-1