EfficientO- andN-(β-fluoroethylation)s with NCA[18F]β-fluoroethyl tosylate under microwave-enhanced conditions
作者:Shui-Yu Lu、Frederick T. Chin、Julie A. McCarron、Victor W. Pike
DOI:10.1002/jlcr.818
日期:2004.4
Reactions of no-carrier-added (NCA) [18F]β-fluoroethyl tosylate with amine, phenol or carboxylic acid to form the corresponding [18F]N-(β-fluoroethyl)amine, [18F]β-fluoroethyl ether or [18F]β-fluoroethyl ester, were found to be rapid (2–10 min) and efficient (51–89% conversion) under microwave-enhanced conditions. These conditions allow reactants to be heated rapidly to 150°C in a low boiling point solvent, such as acetonitrile, and avoid the need to use high boiling point solvents, such as DMSO and DMF, to promote reaction. The microwave-enhanced reactions gave about 20% greater radiochemical yields than thermal reactions performed at similar temperatures and over similar reaction times. With a bi-functional molecule, such as DL-pipecolinic acid, [18F]β-fluoroethyl tosylate reacts exclusively with the amino group. Copyright © 2004 John Wiley & Sons, Ltd.
研究发现,在微波增强条件下,无载体[18F]β-氟乙基对甲苯磺酸酯与胺类、酚类或羧酸发生反应生成相应的[18F]N-(β-氟乙基)胺、[18F]β-氟乙基醚或[18F]β-氟乙基酯的反应快速(2-10分钟)且高效(转化率51-89%)。这些条件允许反应物在低沸点溶剂(如乙腈)中快速加热至150°C,避免了使用二甲基亚砜(DMSO)和二甲基甲酰胺(DMF)等高沸点溶剂来促进反应。与在相似温度和反应时间下进行的热反应相比,微波增强反应的放射化学产率高出约20%。对于二功能分子(如DL-哌啶羧酸),[ 18F]β-氟乙基对甲苯磺酸酯专一性地与氨基发生反应。版权所有 © 2004 John Wiley & Sons, Ltd.