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Updated: Jun 3, 2026

Malachite Green Assay for the Discovery of Heat-Shock Protein 90 Inhibitors
Published on: January 20, 2023
Design and SAR of macrocyclic Hsp90 inhibitors with increased metabolic stability and potent cell-proliferation
Christoph W Zapf1, Jonathan D Bloom, Jamie L McBean
1Medicinal Chemistry, Pfizer, 401 N. Middletown Road, Pearl River, NY 10965, USA. christoph.zapf@pfizer.com
Abstract:
A novel series of macrocyclic ortho-aminobenzamide Hsp90 inhibitors is reported. A basic nitrogen within the tether linking the aniline nitrogen atom to a tetrahydroindolone moiety allowed access to compounds with good physical properties. Important structure-activity relationship information was obtained from this series which led to the discovery of a soluble and stable compound which is potent in an Hsp90 binding and cell-proliferation assay.
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