Ketopiperazine-based renin inhibitors: Optimization of the "C" ring
Holsworth, D.D., Cai, C., Cheng, X.M., Cody, W.L., Downing, D.M., Erasga, N., Lee, C., Powell, N.A., Ednunds, J.J., Stier, M., Jalaie, M., Zhang, E., McConnell, P., Ryan, M.J., Bryant, J., Li, T., Kasani, A., Hall, E., Subedi, R., Rahim, M., Maiti, S.(2006) Bioorg Med Chem Lett 16: 2500-2504
- PubMed: 16480874 
- DOI: https://doi.org/10.1016/j.bmcl.2006.01.084
- Primary Citation of Related Structures:  
2FS4, 2G1N, 2G1O, 2G1R, 2G1S, 2G1Y, 2G20, 2G21, 2G22, 2G24, 2G26, 2G27 - PubMed Abstract: 
A systematic investigation of the S3 sub-pocket activity requirements was conducted. It was observed that linear and sterically small side chain substituents are preferred in the S3 sub-pocket for optimal renin inhibition. Polar groups in the S3-sub-pocket were not well tolerated and caused a reduction in renin inhibitory activity. Further, compounds with clog P's < or = 3 demonstrated a dramatic reduction in CYP3A4 inhibitory activity.
Organizational Affiliation: 
Pfizer Global Research and Development, Michigan Laboratories, Department of Chemistry, Ann Arbor, MI 48105, USA. Daniel.Holsworth@pfizer.com