The use of aqueous potassium dichloroiodate for the synthesis of ureas
作者:Gil Mendes Viana、Lúcia Cruz de Sequeira Aguiar、Jonas de Araújo Ferrão、Alessandro Bolis Costa Simas、Marcela Guariento Vasconcelos
DOI:10.1016/j.tetlet.2012.12.045
日期:2013.2
We report a straightforward and efficient reaction protocol for the syntheses of substituted ureas via treatment of thioureas with aqueous potassium dichloroiodate (KICl2). By tuning the reaction condition, thioureas bearing activated N-aryl substituents may undergo either selective oxidation or sequential oxidation and iodination, forming iodoaryl ureas in the latter case.
Broad Scope and High‐Yield Access to Unsymmetrical Acyclic [
<sup>11</sup>
C]Ureas for Biomedical Imaging from [
<sup>11</sup>
C]Carbonyl Difluoride
作者:Jimmy E. Jakobsson、Sanjay Telu、Shuiyu Lu、Susovan Jana、Victor W. Pike
DOI:10.1002/chem.202100690
日期:2021.7.16
needed for labelling acyclic ureas with carbon-11 (t1/2=20.4 min) as potential radiotracers for biomedical imaging with positronemissiontomography (PET). Herein, we describe the rapid and high-yield syntheses of unsymmetrical acyclic [11C]ureas under mild conditions (room temperature and within 7 min) using no-carrier-added [11C]carbonyl difluoride with aliphatic and aryl amines. This methodology is compatible