Synthesis of a radiotracer for studying σ receptors in vivo using PET: (+)-N-[11C]-benzyl-N-normetazocine (1S, 5S,9S-(+)-cis-2-[11C]-2′-hydroxy-5,9-dimethyl-6,7-benzomorphan)
Stereoselective<sup>11</sup>C Labeling of a “Native” Tetrapeptide by Using Asymmetric Phase-Transfer Catalyzed Alkylation Reactions
作者:Aleksandra Pekošak、Benjamin H. Rotstein、Thomas L. Collier、Albert D. Windhorst、Neil Vasdev、Alex J. Poot
DOI:10.1002/ejoc.201601641
日期:2017.2.3
pharmacophore of octreotide, an antagonist of somatostatin receptors. The asymmetric alkylation with chiral phase-transfer catalysts enabled direct labeling of a variety of isolated 11C-peptides in a highly stereoselective manner (94 % de) with acceptable radiochemical yields (9–10 %) and practical specific activities (15–35 GBq µmol–1 or 405–945 mCi µmol–1) at the end of synthesis. This novel methodology
Stereocontrolled [<sup>11</sup>
C]Alkylation of N-Terminal Glycine Schiff Bases To Obtain Dipeptides
作者:Ulrike Filp、Aleksandra Pekošak、Alex J. Poot、Albert D. Windhorst
DOI:10.1002/ejoc.201701129
日期:2017.10.10
stereoselective radiochemical [11C]alkylation to obtain functionalized dipeptides. We herein report a broadly applicable procedure for the asymmetric [11C]alkylation of dipeptides to give labeled N-terminal peptides by using different [11C]alkyl halides. Contended stereoselectivities of the reactions were observed by using 11C-labeled alkyl halides, [11C]methyl iodide and [11C]benzyliodide, and diastereomeric
A rapid and highly enantioselective C–<sup>11</sup>C bond formation of <scp>l</scp>-[<sup>11</sup>C]phenylalanine via chiral phase-transfer catalysis
作者:Aleksandra Pekošak、Ulrike Filp、Janja Škrinjar、Alex J. Poot、Albert D. Windhorst
DOI:10.1039/c6ob02633h
日期:——
synthesize L- or D-[11C]phenylalanine with an excellent enantiomeric excess of >90% and almost quantitative radiochemical conversion of >95% (n > 5). Additionally, a phase-transfer catalyzed alkylation was utilized on the preparative scale using automated platform. The application resulted in high specific activity ranging from 85–135 GBq μmol−1 of the enantiomerically pure [11C]phenylalanine, showing that the
Improved synthesis and application of [<sup>11</sup>C]benzyl iodide in positron emission tomography radiotracer production
作者:Aleksandra Pekošak、Ulrike Filp、Lonneke Rotteveel、Alex J. Poot、Albert D. Windhorst
DOI:10.1002/jlcr.3307
日期:2015.6.30
Positronemissiontomography has increased the demand for new carbon-11 radiolabeled tracers and building blocks. A promising radiolabeling synthon is [(11) C]benzyliodide ([(11) C]BnI), because the benzyl group is a widely present functionality in biologically active compounds. Unfortunately, synthesis of [(11) C]BnI has received little attention, resulting in limited application. Therefore, we investigated