Macrocyclic lactams as potent Hsp90 inhibitors with excellent tumor exposure and extended biomarker activity.
Zapf, C.W., Bloom, J.D., McBean, J.L., Dushin, R.G., Nittoli, T., Otteng, M., Ingalls, C., Golas, J.M., Liu, H., Lucas, J., Boschelli, F., Hu, Y., Vogan, E., Levin, J.I.(2011) Bioorg Med Chem Lett 21: 3411-3416
- PubMed: 21515049 
- DOI: https://doi.org/10.1016/j.bmcl.2011.03.112
- Primary Citation of Related Structures:  
3R91 - PubMed Abstract: 
A novel series of macrocyclic ortho-aminobenzamide Hsp90 inhibitors is reported. In continuation of our research in this area, macrocyclic amides and lactams were explored to reduce the risk of hERG liabilities. This effort culminated in the discovery of compound 38, which showed a favorable in vitro profile, and efficiently suppressed proliferation of several relevant cell lines. This compound showed prolonged Hsp90-inhibitory activity at least 24 h post-administration, consistent with elevated and prolonged exposure in the tumor.
Organizational Affiliation: 
Medicinal Chemistry, Pfizer, 401 N Middletown Road, Pearl River, NY 10965, United States. chzapf@gmail.com