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

preprint
submitted on 27.05.2020 and posted on 28.05.2020 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.

Funding

Foundation for Women's Wellness

History

Email Address of Submitting Author

cjdocken@gmail.com

Institution

Marquette University

Country

United States

ORCID For Submitting Author

0000-0002-4092-5636

Declaration of Conflict of Interest

No conflicts of interest

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in Organic & Biomolecular Chemistry

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