Rapid Synthesis of Maleimide Functionalized Fluorine-18 Labeled Prosthetic Group Using "radio-fluorination on the Sep-Pak" Method

Overview

Journal J Labelled Comp Radiopharm

Specialties Nuclear Medicine
Pharmacology
Pharmacy
Radiology

Date 2018 Mar 26

PMID 29575176

Citations 4

Authors

Falguni Basuli

Xiang Zhang

Elaine M Jagoda

Peter L Choyke

Rolf E Swenson

Affiliations

Soon will be listed here.

Abstract

Following our recently published fluorine-18 labeling method, "Radio-fluorination on the Sep-Pak", we have successfully synthesized 6-[ F]fluoronicotinaldehyde by passing a solution (1:4 acetonitrile: t-butanol) of its quaternary ammonium salt precursor, 6-(N,N,N-trimethylamino)nicotinaldehyde trifluoromethanesulfonate (2), through a fluorine-18 containing anion exchange cartridge (PS-HCO ). Over 80% radiochemical conversion was observed using 10 mg of precursor within 1 minute. The [ F]fluoronicotinaldehyde ([ F]5) was then conjugated with 1-(6-(aminooxy)hexyl)-1H-pyrrole-2,5-dione to prepare the fluorine-18 labeled maleimide functionalized prosthetic group, 6-[ F]fluoronicotinaldehyde O-(6-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)hexyl) oxime, 6-[ F]FPyMHO ([ F]6). The current Sep-Pak method not only improves the overall radiochemical yield (50 ± 9%, decay-corrected, n = 9) but also significantly reduces the synthesis time (from 60-90 minutes to 30 minutes) when compared with literature methods for the synthesis of similar prosthetic groups.

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