Synthesis of <sup>13</sup>N-labelled polysubstituted triazoles via Huisgen cycloaddition
作者:S. M. Joshi、V. Gómez-Vallejo、V. Salinas、J. Llop
DOI:10.1039/c6ra24670b
日期:——
the incorporation of 13N in the toolbox of PET chemists might be a valuable option for the preparation of new labelled compounds or incorporation of the label in different positions. Here we present the unprecedented radiosynthesis of 13N-labelled polysubstituted triazoles via Huisgen cycloaddition by reaction of 13N-labelled aromatic azides with alkyne derivatives and aldehydes. Six different 13N-labelled
由于其半衰期短(T 1/2 = 9.97分钟),历史上一直限制使用正电子发射极氮13(13 N )。但是,它的稳定同位素(14号氮和15号氮)存在于许多生物活性分子中。因此,在PET化学家的工具箱中掺入13 N可能是制备新标记化合物或在不同位置掺入标记的有价值的选择。在这里,我们介绍了13个N标记的芳族叠氮化物与炔烃衍生物和醛的反应,通过惠斯根环加成反应,空前地合成了13个N标记的多取代三唑。六种不同的13N标记的三唑已成功合成。经过合成过程的自动化和实验条件的优化,可以制备出一种具有高放射化学纯度和经衰减校正的放射化学产率为11±2%的三唑。获得的活性量应足以进行将来的体外和体内研究。这种新颖的方法可能会为放射性示踪剂的制备开辟新的途径,而使用其他更常规的正电子发射器则无法对其进行标记。
Activation of ammonia dissociation by oxygen on platinum sponge studied with positron emission profiling
作者:D.P Sobczyk、A.M de Jong、E.J.M Hensen、R.A van Santen
DOI:10.1016/s0021-9517(03)00191-x
日期:2003.10.1
(PEP) is applied to study the adsorption and dissociation of ammonia on metallic and preoxidized platinum sponge in the temperature range 323–573 K. The results show that ammonia weakly interacts with platinum without dissociation. On the contrary, preoxidized platinum is able to dissociate ammonia. With increasing temperature more ammonia is converted into N2, N2O, and H2O. Adsorbed NO appears to be