Preliminary investigation of 6,7-dihydropyrazolo[1,5- a ]pyrazin-4-one derivatives as a novel series of mGlu 5 receptor positive allosteric modulators with efficacy in preclinical models of schizophrenia
作者:Susana Conde-Ceide、Jesús Alcázar、Sergio A. Alonso de Diego、Silvia López、María Luz Martín-Martín、Carlos M. Martínez-Viturro、Miguel-Angel Pena、Han Min Tong、Hilde Lavreysen、Claire Mackie、Thomas M. Bridges、J. Scott Daniels、Colleen M. Niswender、Carrie K. Jones、Gregor J. Macdonald、Thomas Steckler、P. Jeffrey Conn、Shaun R. Stauffer、Craig W. Lindsley、José Manuel Bartolomé-Nebreda
DOI:10.1016/j.bmcl.2015.11.098
日期:2016.1
As part of our efforts to identify a suitable back-up compound to our recently disclosed mGlu(5) positive allosteric modulator (PAM) clinical candidate VU0490551/JNJ-46778212, this letter details the investigation and challenges of a novel series of 6,7-dihydropyrazolo[1,5-a]pyrazin-4-one derivatives. From these efforts, compound 4k emerged as a potent and selective mGlu(5) PAM displaying overall attractive in vitro (pharmacological and ADMET) and PK profiles combined with in vivo efficacy in preclinical models of schizophrenia. However, further advancement of the compound was precluded due to severely limiting CNS-related side-effects confirming the previously reported association between excessive mGlu(5) activation and target-related toxicities. (C) 2015 Elsevier Ltd. All rights reserved.