Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 25, Issue 2, Pages 288-291Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2014.11.048
Keywords
Positron emission tomography; Fluorine-18; SL25.1188; MAO-B
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Funding
- Ontario Ministry of Research and Innovation
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Carbon-11 labeled SL25.1188 ((S)-5-(methoxymethyl)-3-(6-(4,4,4-trifluorobutoxy) benzo[d] isoxazol-3yl) oxazolidin-2-one) is a reversible radiotracer for monoamine oxidase B that was recently evaluated in healthy volunteers by positron emission tomography (PET). Herein we report the preparation and ex vivo evaluation of a fluorinated SL25.1188 derivative as a candidate 18F-labeled PET radiotracer. (S)-3-(6-(3-fluoropropoxy) benzo[d] isoxazol-3-yl)-5-(methoxy methyl) oxazolidin-2-one (1) was labeled with fluorine-18 in 51% uncorrected radiochemical yield having high radiochemical purity (> 98%) and specific activity (109 26 GBq/lmol). Ex vivo biodistribution studies demonstrated low radioactivity retention, specific binding and metabolic stability within rat brains. High uptake of radioactivity in bone is consistent with metabolic defluorination. In vitro binding assays of longer chain fluoroalkoxy derivatives revealed that the length of the carbon chain is an integral feature in MAO-B inhibitor potency and selectivity within this scaffold. (C) 2014 Elsevier Ltd. All rights reserved.
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