Direct fixation of [<sup>11</sup>C]-CO<sub>2</sub>by amines: formation of [<sup>11</sup>C-carbonyl]-methylcarbamates
作者:Alan A. Wilson、Armando Garcia、Sylvain Houle、Neil Vasdev
DOI:10.1039/b916419g
日期:——
[11C-Carbonyl]-methylcarbamates can be synthesised directly from [11C]-CO2 and primary or secondary amines in a one-pot, two-step reaction. The use of either diazabicyclo[5.4.0]undec-7-ene (DBU) or 2-tert-butylimino-2-diethylamino-1,3-dimethyl-perhydro-1,3,2-diazaphosphorine (BEMP) enables efficient trapping of [11C]-CO2 in small volumes of DMF as [11C]-carbamate salts. Subsequent reaction with a variety of methylating agents rapidly generates the desired [11C-carbonyl]-methylcarbamates in high radiochemical yields. The usefulness of the method is illustrated by the efficient radiosynthesis of a kappa opioid receptor imaging radiotracer, useful in positron emission tomography (PET).
[11C-羰基]-甲基氨基甲酸酯可以通过[11C]-CO2和一级或二级胺在一个反应锅中进行直接合成,反应分为两个步骤。使用二氮杂双环[5.4.0]十一烯(DBU)或2-tert-丁基亚氨基-2-二乙氨基-1,3-二甲基-全氢-1,3,2-二氮基磷烷(BEMP)能够有效地在小体积DMF中捕获[11C]-CO2,形成[11C]-氨基甲酸盐。随后与多种甲基化试剂反应,迅速生成所需的[11C-羰基]-甲基氨基甲酸酯,且放射化学产率较高。该方法的实用性通过有效的放射合成kappa阿片受体成像放射性示踪剂得以体现,后者在正电子发射断层扫描(PET)中具有重要应用。