Probing Structural Requirements of Positive Allosteric Modulators of the M4 Muscarinic Receptor

The M, mAChR is implicated in several CNS disorders and possesses an allosteric binding site for which ligands modulating the affinity and/or efficacy of ACh may be exploited for selective receptor targeting. We report the synthesis of a focused library of putative M-4 PAMs derived from VU0152100 and VU10005. These compounds investigate the pharmacological effects of previously identified methoxy and fluoro substituents, providing useful estimates of affinity (K-B), cooperativity (alpha beta), and direct agonist properties (tau(B)).