No-carrier-added (NCA) aromatic and aliphatic [carbonyl-11C]amides were rapidly (<5 min) synthesized in one pot in useful radiochemical yields (20–65%, decay-corrected) by directly coupling amines with NCA [11C]carboxyhyphenmagnesium halides generated in situ from Grignard reagents and cyclotron-produced [11C]carbon dioxide. In this system cyclohexylcarboxymagnesium chloride (1b) is more reactive than 4-fluorophenylcarboxymagnesium bromide (2b) and primary amines (e.g. aniline, aminopyridines) far more reactive than secondary amines (e.g. 2-(methylamino)pyridine). The scope of the reaction was widened considerably by the application of microwaves, which allowed reactions to be carried out at much higher temperature than the boiling point of the solvent (i.e. tetrahydrofuran, b.p. 67°C). Copyright © 2003 John Wiley & Sons, Ltd.
无载体的芳香和脂肪族[羰基-11C]酰胺通过直接将胺与NCA [11C]
羧酸镁卤化物(由Grignard试剂和回旋加速器产生的
[11C]二氧化碳在位生成)耦合,快速(<5分钟)合成,产率有用的放射化学产率(20-65%,衰减校正)。在这个系统中,环己基羧酸镁氯化物(1b)比4-氟苯基羧酸镁溴化物(2b)更具反应性,而伯胺(例如苯胺,氨基吡啶)远比仲胺(例如2-(甲氨基)吡啶)更具反应性。通过应用微波,反应范围大大扩展,微波允许反应在远高于溶剂沸点的温度下进行(即
四氢呋喃,沸点67°C)。版权所有 © 2003 John Wiley & Sons, Ltd.