Tetrahydronaphthyridine and Dihydronaphthyridinone Ethers As Positive Allosteric Modulators of the Metabotropic Glutamate Receptor 5 (mGlu<sub>5</sub>)
作者:Mark Turlington、Chrysa Malosh、Jon Jacobs、Jason T. Manka、Meredith J. Noetzel、Paige N. Vinson、Satyawan Jadhav、Elizabeth J. Herman、Hilde Lavreysen、Claire Mackie、José M. Bartolomé-Nebreda、Susana Conde-Ceide、M. Luz Martín-Martín、Han Min Tong、Silvia López、Gregor J. MacDonald、Thomas Steckler、J. Scott Daniels、C. David Weaver、Colleen M. Niswender、Carrie K. Jones、P. Jeffrey Conn、Craig W. Lindsley、Shaun R. Stauffer
DOI:10.1021/jm500259z
日期:2014.7.10
Positive allosteric modulators (PAMs) of metabotropic glutamate receptor 5 (mGlu(5)) represent a promising therapeutic strategy for the treatment of schizophrenia. Starting from an acetylene-based lead from high throughput screening, an evolved bicyclic dihydronaphthyridinone was identified. We describe further refinements leading to both dihydronaphthyridinone and tetrahydronaphthyridine mGlu(5) PAMs containing an alkoxy-based linkage as an acetylene replacement. Exploration of several structural features including western pyridine ring isomers, positional amides, linker connectivity/position, and combinations thereof, reveal that these bicyclic modulators generally exhibit steep SAR and within specific subseries display a propensity for pharmacological mode switching at mGlu(5) as well as antagonist activity at mGlu(3). Structure-activity relationships within a dihydronaphthyridinone subseries uncovered 12c (VU0405372), a selective mGlu(5) PAM with good in vitro potency, low glutamate fold-shift, acceptable DMPK properties, and in vivo efficacy in an amphetamine-based model of psychosis.