Comparison of pathways to the versatile synthon of no-carrier-added 1-bromo-4-[18F]fluorobenzene
作者:Johannes Ermert、Carsten Hocke、Thomas Ludwig、René Gail、Heinz H. Coenen
DOI:10.1002/jlcr.830
日期:2004.6
The availability of no-carrier-added (n.c.a.) 1-bromo-4-[18F]fluorobenzene with high radiochemical yields is important for 18F-arylation reactions using metallo-organic 4-[18F]fluorophenyl compounds (e.g. of lithium or magnesium) or Pd-catalyzed coupling. In this study, different methods for the preparation of 1-bromo-4-[18F]fluorobenzene by nucleophilic aromatic substitution reactions using n.c.a. [18F]fluoride were examined. Of six pathways compared, symmetrical bis-(4-bromphenyl)iodonium bromide proved most useful to achieve the title compound in a direct, one-step nucleophilic substitution with a radiochemical yield (RCY) of 65% within 10 min. Copyright © 2004 John Wiley & Sons, Ltd.
无载体添加(n.c.a. )1-溴-4-[18F]氟苯的高放射化学收率对于使用金属有机 4-[18F]氟苯化合物(如锂或镁)或钯催化偶联的 18F 芳基化反应非常重要。本研究考察了利用正交[18F]氟化物通过亲核芳香取代反应制备 1-溴-4-[18F]氟苯的不同方法。在比较的六种途径中,对称的双-(4-溴苯基)碘溴化物被证明是最有用的,它能在 10 分钟内通过直接、一步亲核取代反应制备出 65% 的放射性化学收率 (RCY)的标题化合物。Copyright © 2004 John Wiley & Sons, Ltd. All Rights Reserved.