Guo Ning, Alagille David, Tamagnan Gilles, Price Ronald R, Baldwin Ronald M
Department of Radiology & Radiological Sciences, Vanderbilt University School of Medicine, 1161 21st Avenue South, Nashville, TN 37232, USA.
Appl Radiat Isot. 2008 Oct;66(10):1396-402. doi: 10.1016/j.apradiso.2008.03.003. Epub 2008 Mar 10.
The meta-halo-3-methylbenzonitrile derivatives (-F, -Cl, -Br, -I) were synthesized as model compounds to study reactivity towards aromatic nucleophilic substitution. A single-mode microwave system was incorporated into a commercial radiochemical synthetic module for (18)F labeling. Labeling yields of 64% for fluoro-, 13% for bromo- and 9% for chloro-precursors were achieved in DMSO in <3 min. The observed order of reactivity of the leaving groups toward aromatic nucleophilic substitution was F>>Br>Cl>>>I.
合成了间卤代-3-甲基苯腈衍生物(-F、-Cl、-Br、-I)作为模型化合物,以研究其对芳香亲核取代反应的活性。将单模微波系统集成到用于(18)F标记的商业放射化学合成模块中。在二甲基亚砜中,<3分钟内氟代前体的标记产率为64%,溴代前体为13%,氯代前体为9%。观察到离去基团对芳香亲核取代反应的活性顺序为F>>Br>Cl>>>I。