Syntheses of 5-(2-radiohaloethyl)- and 5-(2-radiohalovinyl)-2?- deoxyuridines. Novel types of radiotracer for monitoring cancer gene therapy with PET
作者:Chung-Shan Yu、Joseph Eisenbarth、Armin Runz、Klaus Weber、Stephan Zeisler、Franz Oberdorfer
DOI:10.1002/jlcr.684
日期:2003.4
Syntheses of 5-(2-[18F]fluoroethyl)- (1), 5-(2-[80Br]bromoethyl)- (2), un-deprotected (E)-5-(2-[18F]fluorovinyl)- (3) and (E)-5-(2-[80Br]bromovinyl)-2′-deoxyuridines (4) as the tracers for monitoring cancer gene therapy with positron emission tomography were described. Decay corrected radiochemical yield and synthesis time including labeling and HPLC purification from end of bombardment for 1 was 9.5% and 2 hours, respectively; yield and time for 2 was 16% and 2 hours, respectively. Chemical (approximate to radiochemical) yield and time for synthesis of 3 was 7.5% and 7 minutes, respectively. Radiochemical yield and synthesis time including labeling and HPLC purification of an analytical sample of 4 was 60% and 30 minutes, respectively. Both 2 and 4 received the side reactions during HPLC purification, i.e. ring closure and cleavage of glycosidic bond, respectively. Application of 2 and 4 needed to be confirmed by in vitro or in vivo experiments. Radiochemical yield of 1 could be optimized by employing a modified protocol for preparation of its precursor. The preparation of fluorovinyl counterparts had demonstrated the potential utility of the stannane, 3-tolyl-3′,5′-di-O-acetyl-(E)-5-(2-stannylvinyl)-2′-deoxyuridine 7. Copyright © 2003 John Wiley & Sons, Ltd.
介绍了 5-(2-[18F]氟乙基)-(1)、5-(2-[80Br]溴乙基)-(2)、未脱保护(E)-5-(2-[18F]氟乙烯基)-(3)和(E)-5-(2-[80Br]溴乙烯基)-2′-脱氧尿苷(4)的合成,这些示踪剂可用于正电子发射断层扫描监测癌症基因治疗。1 的衰变校正放射化学收率和合成时间(包括从轰击结束到标记和 HPLC 纯化)分别为 9.5%和 2 小时;2 的收率和合成时间分别为 16%和 2 小时。3 的化学(近似于放射化学)产率和合成时间分别为 7.5%和 7 分钟。4 的放射化学产率和合成时间(包括标记和 HPLC 纯化分析样品)分别为 60% 和 30 分钟。在 HPLC 纯化过程中,2 和 4 都发生了副反应,即分别发生了环闭合和糖苷键裂解。2 和 4 的应用需要通过体外或体内实验来证实。通过采用修改后的前体制备方案,可以优化 1 的放射化学收率。氟乙烯基对应物的制备证明了锡烷、3-甲苯基-3′,5′-二-O-乙酰基-(E)-5-(2-锡乙烯基)-2′-脱氧尿苷 7 的潜在用途。Copyright © 2003 John Wiley & Sons, Ltd. All rights reserved.