These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
2 files

Route Exploration and Synthesis of the Reported Pyridone-Based PDI Inhibitor STK076545

submitted on 27.05.2020, 05:31 and posted on 28.05.2020, 11:15 by Eric Greve, Sergey Lindeman, Chris Dockendorff
The enzyme protein disulfide isomerase (PDI) is essential for the correct folding of proteins and the activation of certain cell surface receptors, and is a promising target for the treatment of cancer and thrombotic conditions. A previous high-throughput screen identified the commercial compound STK076545 as a promising PDI inhibitor. To confirm its activity and support further biological studies, a resynthesis was pursued of the reported b-keto-amide with an N-alkylated pyridone at the a-position. Numerous conventional approaches were complicated by undesired fragmentations or rearrangements. However, a successful 5-step synthetic route was achieved using an aldol reaction with an a-pyridone allyl ester as a key step. An X-ray crystal structure of the final compound confirmed that the reported structure of STK076545 was achieved, however its lack of PDI activity and inconsistent spectral data suggest that the commercial structure was misassigned.


Foundation for Women's Wellness


Email Address of Submitting Author


Marquette University


United States

ORCID For Submitting Author


Declaration of Conflict of Interest

No conflicts of interest


Read the published paper

in Organic & Biomolecular Chemistry