4363-13-7Relevant articles and documents
Challenges in the development of an M4 PAM preclinical candidate: The discovery, SAR, and biological characterization of a series of azetidine-derived tertiary amides
Tarr, James C.,Wood, Michael R.,Noetzel, Meredith J.,Melancon, Bruce J.,Lamsal, Atin,Luscombe, Vincent B.,Rodriguez, Alice L.,Byers, Frank W.,Chang, Sichen,Cho, Hyekyung P.,Engers, Darren W.,Jones, Carrie K.,Niswender, Colleen M.,Wood, Michael W.,Brandon, Nicholas J.,Duggan, Mark E.,Jeffrey Conn,Bridges, Thomas M.,Lindsley, Craig W.
, p. 5179 - 5184 (2017/11/03)
Herein we describe the continued optimization of M4 positive allosteric modulators (PAMs) within the 5-amino-thieno[2,3-c]pyridazine series of compounds. In this letter, we disclose our studies on tertiary amides derived from substituted azetidines. This series provided excellent CNS penetration, which had been challenging to consistently achieve in other amide series. Efforts to mitigate high clearance, aided by metabolic softspot analysis, were unsuccessful and precluded this series from further consideration as a preclinical candidate. In the course of this study, we found that potassium tetrafluoroborate salts could be engaged in a tosyl hydrazone reductive cross coupling reaction, a previously unreported transformation, which expands the synthetic utility of the methodology.
AMINO-HETEROCYCLIC COMPOUNDS
-
Page/Page column 25-26, (2010/08/07)
The invention provides PDE9-inhibiting compounds of Formula (I), and pharmaceutically acceptable salts thereof, wherein R1, R2, R3, A, and n are as defined herein. Pharmaceutical compositions containing the compounds of Formula I, and uses thereof in treating neurodegenerative and cognitive disorders, such as Alzheimer's disease and schizophrenia, are also provided.