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Updated: Feb 14, 2026

A BW Reporter System for Studying Receptor-Ligand Interactions
Published on: January 7, 2019
Optimization of the metabolic stability of a fluorinated cannabinoid receptor subtype 2 (CB2) ligand designed for PET
Dominik Heimann1, Frederik Börgel1, Henk de Vries2
1Institut für Pharmazeutische und Medizinische Chemie der Universität Münster, Corrensstraße 48, D-48149 Münster, Germany.
Abstract:
The central CB2 receptor represents a promising target for the treatment of neuroinflammatory diseases as CB2 activation mediates anti-inflammatory effects. Recently, the F-18 labeled PET radiotracer [18F]7a was reported, which shows high CB2 affinity and high selectivity over the CB1 subtype but low metabolic stability due to hydrolysis of the amide group. Based on these findings twelve bioisosteres of 7a were synthesized containing a non-hydrolysable functional group instead of the amide group. The secondary amine 23a (Ki = 7.9 nM) and the ketone 26a (Ki = 8.6 nM) displayed high CB2 affinity and CB2:CB1 selectivity in in vitro radioligand binding studies. Incubation of 7a, 23a and 26a with mouse liver microsomes and LC-quadrupole-MS analysis revealed a slightly higher metabolic stability of secondary amine 23a, but a remarkably higher stability of ketone 26a in comparison to amide 7a. Furthermore, a logD7.4 value of 5.56 ± 0.08 was determined for ketone 26a by micro shake-flask method and LC-MS quantification.
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