Discovery of Allosteric Potentiators for the Metabotropic Glutamate 2 Receptor: Synthesis and Subtype Selectivity of N-(4-(2-Methoxyphenoxy)phenyl)-N-(2,2,2− trifluoroethylsulfonyl)pyrid-3-ylmethylamine

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Abstract
This report describes recently discovered novel allosteric modulators of metabotropic glutamate2 (mGlu2) receptors. These pyridylmethylsulfonamides (e.g., 3) potentiate glutamate, shifting agonist potency by 2-fold. This effect was specific for mGlu2 (vs mGlu1,3−8 receptors). Also, 3 failed to potentiate a chimeric mGlu2/1 receptor, demonstrating the mGlu2 transmembrane region's critical involvement. In a fear-potentiated startle model, 3 showed anxiolytic activity that was prevented by mGlu2/3 antagonist pretreatment. Thus, these pyridylmethylsulfonamides represent the first mGlu2 receptor potentiators discovered.