Synthesis and SAR Studies of imidazo-[1,2-a]-pyrazine Aurora kinase inhibitors with improved off target kinase selectivity

Experimental Data Snapshot

  • Resolution: 2.66 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 

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Synthesis and SAR studies of imidazo-[1,2-a]-pyrazine Aurora kinase inhibitors with improved off-target kinase selectivity.

Voss, M.E.Rainka, M.P.Fleming, M.Peterson, L.H.Belanger, D.B.Siddiqui, M.A.Hruza, A.Voigt, J.Gray, K.Basso, A.D.

(2012) Bioorg Med Chem Lett 22: 3544-3549

  • DOI: https://doi.org/10.1016/j.bmcl.2012.03.051
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure-activity relationships of new Aurora A/B kinase inhibitors derived from the previously identified kinase inhibitor 12 are described. Introduction of acetic acid amides onto the pyrazole of compound 12 was postulated to influence Aurora A/B selectivity and improve the profile against off-target kinases. The SAR of the acetic acid amides was explored and the effect of substitution on enzyme inhibition as well as mechanism-based cell activity was studied. Additionally, several of the more potent inhibitors were screened for their off-target kinase selectivity.

  • Organizational Affiliation

    AMRI Global, 26 Corporate Circle, Albany, NY 12212, USA. matthew.voss@amriglobal.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aurora kinase A272Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O14965 (Homo sapiens)
Explore O14965 
Go to UniProtKB:  O14965
PHAROS:  O14965
GTEx:  ENSG00000087586 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14965
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 0FY

Download Ideal Coordinates CCD File 
B [auth A]3-(1-{2-[(3-fluoropyridinium-4-yl)amino]-2-oxoethyl}-1H-pyrazol-4-yl)-6-methyl-8-[(3-{[(1R,3R)-3-methylpiperidinium-1-yl]methyl}-1,2-thiazol-5-yl)amino]imidazo[1,2-a]pyrazin-1-ium
C27 H32 F N10 O S
Binding Affinity Annotations 
IDSourceBinding Affinity
0FY PDBBind:  3VAP IC50: 4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.66 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.329α = 90
b = 83.329β = 90
c = 157.7γ = 120
Software Package:
Software NamePurpose
StructureStudiodata collection
autoPROCdata scaling
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-02
    Type: Initial release
  • Version 1.1: 2012-05-23
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations, Refinement description