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Title: Titania-catalyzed radiofluorination of tosylated precursors in highly aqueous medium

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b02659· OSTI ID:1345980
 [1];  [1];  [1];  [1];  [1]
  1. David Geffen School of Medicine at Univ. of California, Los Angeles, CA (United States)

Nucleophilic radiofluorination is an efficient synthetic route to many positron-emission tomography (PET) probes, but removal of water to activate the cyclotron-produced [18F]fluoride has to be performed prior to reaction, which significantly increases overall radiolabeling time and causes radioactivity loss. In this paper, we demonstrate the possibility of 18F-radiofluorination in highly aqueous medium. The method utilizes titania nanoparticles, 1:1 (v/v) acetonitrile–thexyl alcohol solvent mixture, and tetra-n-butylammonium bicarbonate as a phase-transfer agent. Efficient radiolabeling is directly performed with aqueous [18F]fluoride without the need for a drying/azeotroping step to significantly reduce radiosynthesis time. High radiochemical purity of the target compound is also achieved. Finally, the substrate scope of the synthetic strategy is demonstrated with a range of aromatic, aliphatic, and cycloaliphatic tosylated precursors.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0001249
OSTI ID:
1345980
Journal Information:
Journal of the American Chemical Society, Vol. 137, Issue 17; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (11)

Chemie der Positronenemissionstomographie: Aktuelle Fortschritte bei 11 C‐, 18 F‐, 13 N‐ und 15 O‐Markierungsreaktionen journal January 2019
Catalyst-Controlled Selectivity in the Synthesis of C2- and C3-Sulfonate Esters from Quinoline N -Oxides and Aryl Sulfonyl Chlorides journal July 2016
Fast and reliable generation of [ 18 F]triflyl fluoride, a gaseous [ 18 F]fluoride source journal January 2018
Chemistry for Positron Emission Tomography: Recent Advances in 11 C-, 18 F-, 13 N-, and 15 O-Labeling Reactions journal January 2019
An azeotropic drying-free approach for copper-mediated radiofluorination without addition of base journal February 2019
Acidic Handle Assemble Heterogeneous Carbocatalyst for Facile Aliphatic Nucleophilic Fluorination journal September 2019
Development of Customized [18F]Fluoride Elution Techniques for the Enhancement of Copper-Mediated Late-Stage Radiofluorination journal March 2017
The recent development of efficient Earth-abundant transition-metal nanocatalysts journal January 2017
Performing multi-step chemical reactions in microliter-sized droplets by leveraging a simple passive transport mechanism journal January 2017
Fluorine-18 labelled building blocks for PET tracer synthesis journal January 2017
Recent progress on fluorination in aqueous media journal January 2017

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