Synthesis and biological evaluation of 1-(2,4,5-trisubstituted phenyl)-3-(5-cyanopyrazin-2-yl)ureas as potent Chk1 kinase inhibitors
Li, G., Hasvold, L.A., Tao, Z.-F., Wang, G.T., Gwaltney II, S.L., Patel, J., Kovar, P., Credo, R.B., Chen, Z., Zhang, H., Park, C., Sham, H.L., Sowin, T., Rosenberg, S.H., Lin, N.-H.(2006) Bioorg Med Chem Lett 16: 2293-2298
- PubMed: 16446090 
- DOI: https://doi.org/10.1016/j.bmcl.2006.01.028
- Primary Citation of Related Structures:  
2YWP - PubMed Abstract: 
Based on the X-ray crystallography of our lead compound 1-(5-chloro-2,4-dimethoxyphenyl)-3-(5-cyanopyrazin-2-yl)urea in the checkpoint kinase 1 (Chk1) enzyme, we modified R4, and to a lesser extent, R2, and R5 of the phenyl ring, and made a variety of N-aryl-N'-pyrazinylurea Chk1 inhibitors ...