Search tips
Search criteria 


Logo of acsmedlettACS PublicationsThis JournalSearchSubmit a manuscript
ACS Medicinal Chemistry Letters
ACS Med Chem Lett. 2015 July 9; 6(7): 726–728.
Published online 2015 June 5. doi:  10.1021/acsmedchemlett.5b00185
PMCID: PMC4499835

Pyrrolopyridine or Pyrazolopyridine Derivatives

Title:Pyrrolopyridine or Pyrazolopyridine Derivatives
Patent/Patent Application Number:WO2015028483A1Publication date:March 5, 2015
Priority Application:EP13182351.0Priority date:August 30, 2013
Inventors:Ballard, T. M.; Flohr, A.; Groebke Zbinden, K.; Pinard, E.
Assignee Company:Hoffmann-La Roche, Inc.
Disease Area:Central Nervous SystemBiological Target:Muscarinic Ml receptor
Summary:The muscarinic receptors (mAChRs) are a family of G-protein coupled receptors (GPCRs) that are activated by acetylcholine (ACh), an important neurotransmitter. To date, five distinct individual mAChRs, M1–M5, have been identified. The M1 receptor is primarily located in the brain, with highest expression levels found in the striatum, thalamus, hippocampus, and cortex. It has been demonstrated that modulation of M1 receptor activity can have an impact on disorders of the central nervous system including schizophrenia and Alzheimer’s disease. Specifically, Xanomeline improved cognitive scores and reduced psychotic-like behavior in Alzheimer’s disease. In addition, M1 receptor activity plays an important role in memory and learning, as well as the regulation of dopamine and NMDA receptor activity. The M1 receptor has been the subject of intense study directed toward the identification of novel therapies for diseases and disorders of the central nervous system. The present disclosure describes a series of novel pyrrolopyridine and pyrazolopyridine that are positive allosteric modulators (PAM) of the M1 receptor. These compounds may be useful for the treatment of diseases mediated by the M1 receptor such as Alzheimer’s disease, cognitive impairment, schizophrenia, pain, and sleep disorders.
Important Compound Classes:
An external file that holds a picture, illustration, etc.
Object name is ml-2015-00185y_0001.jpg
Definitions:R1 is halogen, lower alkyl, lower alkoxy, cyano, phenyl, C(O)NHCH3, C(O)NH2, lower alkyl substituted by halogen, or is a five-membered heteroaryl group, optionally substituted by lower alkyl;
Y1 is N or CH;
Y2 is CH;
and if Y1 is CH, Y1 and Y2 may form together with the C atoms to which they are attached a ring, containing −CH=N–N(CH3)–, −CH=N–N(H)–;
X is CH or N;
R is (CH2)m-cyc1oalkyl, optionally substituted by hydroxy, lower alkoxy, or lower alkyl, or is tetrahydropyran, optionally substituted by hydroxy, or is lower alkoxy, substituted by hydroxy, or is lower alkyl substituted by one or two hydroxy, or is (CH2)m-pyridinyl, optionally substituted by hydroxy, lower alkyl, or lower alkyl substituted by hydroxy, or is l-phenyl, optionally substituted by hydroxy, lower alkyl, or lower alkyl substituted by hydroxy, and
L is a bond, −CH(CH2OH)– or −CH2CH(OH)–;
n is 0, 1, or 2;
m is 0 or 1;
or to a pharmaceutically acceptable acid addition salt, to a racemic mixture, or to its corresponding enantiomer and/or optical isomers thereof.
Key Structures:
An external file that holds a picture, illustration, etc.
Object name is ml-2015-00185y_0003.jpg
An external file that holds a picture, illustration, etc.
Object name is ml-2015-00185y_0004.jpg
Recent Review Articles:1. Foster D. J.; Choi D. L.; Conn P. J.; Rook J. M.Activation of M1 and M4 muscarinic receptors as potential treatments for Alzheimer’s disease and schizophrenia. Neuropsychiatr. Dis. Treat. 2014, 10, 183–191. [PubMed]
1. Davie B. J.; Christopoulos A.; Scammells P. J.Development of M1 mAChR allosteric and bitopic ligands: prospective therapeutics for the treatment of cognitive deficits. ACS Chem. Neurosci. 2013, 4 (7), 1026–1048. [PubMed]
1. Kuduk S. D.; Beshore D. C.Novel M1 allosteric ligands: a patent review. Expert Opin. Ther. Pat. 2012, 22 (12), 1385–1398. [PubMed]
Biological Assay:Muscarinic Ml receptor positive allosteric modulator assay.
 Compounds were assessed for their ability to modulate muscarinic M1 receptor activity in CHO cells genetically engineered to express either the rat or human muscarinic M1 receptor. The assays were executed on a Fluorometric Imaging Plate Reader System (FLIPR, Molecular Devices) by measuring the effect of varying concentrations of the test compounds on basal and acetylcholine-stimulated Ca2+ levels.
Biological Data:
An external file that holds a picture, illustration, etc.
Object name is ml-2015-00185y_0002.jpg
Claims:25 Total claims
18 Composition of matter claims
1 Process claim
6 Method of use claims


The authors declare no competing financial interest.

Articles from ACS Medicinal Chemistry Letters are provided here courtesy of American Chemical Society