作者:Till Blum、Johannes Ermert、Walter Wutz、Dirk Bier、Heinz H. Coenen
DOI:10.1002/jlcr.829
日期:2004.6
The precursor synthesis and the no-carrier-added (n.c.a.) radiosynthesis of the adenosine-A1 receptor ligand 5′-(methyl[75Se]seleno)-N6-cyclopentyladenosine ([75Se]1) are described in this report. A method was developed starting from elemental n.c.a. selenium-75, followed by a three-step polymer-supported radioselenation and deprotection which gave the radioligand with a radiochemical yield of 30%, a radiochemical purity of > 99% and a specific radioactivity of > 300 GBq/mmol (8 Ci/mmol). Preparation time was 40 min. The nonradioactive compound 5′-(methylseleno)-N6-cyclopentyladenosine (1) was pharmacologically evaluated in vitro and showed high affinity and selectivity for the adenosine-A1 receptor. These preliminary results suggest that this compound could be a useful radioligand for the noninvasive imaging of the brain adenosine-A1 receptors using positron emission tomography (PET) when labelled with the positron emitter selenium-73 (half-life: 7.1 h). Copyright © 2004 John Wiley & Sons, Ltd.
本报告描述了腺苷-A1 受体配体 5′-(甲基[75Se]硒)-N6-环戊基腺苷([75Se]1)的前体合成和无载体添加(n.c.a. )放射合成。所开发的方法是从元素 n.c.a.硒-75,然后经过三步聚合物支持的放射硒化和脱保护,得到放射配体,其放射化学收率为 30%,放射化学纯度大于 99%,比放射性大于 300 GBq/mmol(8 Ci/mmol)。制备时间为 40 分钟。对非放射性化合物 5′-(甲基硒)-N6-环戊基腺苷(1)进行了体外药理评估,结果显示其对腺苷-A1 受体具有很高的亲和力和选择性。这些初步结果表明,该化合物与正电子发射体硒-73(半衰期:7.1 小时)标记后,可作为一种有用的放射性配体,利用正电子发射断层扫描(PET)对脑腺苷-A1 受体进行无创成像。Copyright © 2004 John Wiley & Sons, Ltd. All Rights Reserved.