1
|
Bjørnstad F, Havik S, Aarhus TI, Mahdi I, Unger A, Habenberger P, Degenhart C, Eickhoff J, Klebl BM, Sundby E, Hoff BH. Pyrrolopyrimidine based CSF1R inhibitors: Attempted departure from Flatland. Eur J Med Chem 2024; 265:116053. [PMID: 38141285 DOI: 10.1016/j.ejmech.2023.116053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/08/2023] [Accepted: 12/11/2023] [Indexed: 12/25/2023]
Abstract
The colony-stimulating factor 1 receptor (CSF1R) is an attractive target for inflammation disorders and cancers. Based on a series of pyrrolo[2,3-d]pyrimidine containing two carbo-aromatic rings, we have searched for new CSF1R inhibitors having a higher fraction of sp3-atoms. The phenyl unit in the 4-amino group could efficiently be replaced by tetrahydropyran (THP) retaining inhibitor potency. Exchanging the 6-aryl group with cyclohex-2-ene units also resulted in highly potent compounds, while fully saturated ring systems at C-6 led to a loss of activity. The structure-activity relationship study evaluating THP containing pyrrolo[2,3-d]pyrimidine derivates identified several highly active inhibitors by enzymatic studies. A comparison of 11 pairs of THP and aromatic compounds showed that inhibitors containing THP had clear benefits in terms of enzymatic potency, solubility, and cell toxicity. Guided by cellular experiments in Ba/F3 cells, five CSF1R inhibitors were further profiled in ADME assays, indicating the para-aniline derivative 16t as the most attractive compound for further development.
Collapse
Affiliation(s)
- Frithjof Bjørnstad
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, NO-7491, Trondheim, Norway; Department of Material Science, Norwegian University of Science and Technology (NTNU), NO-7491, Trondheim, Norway
| | - Simen Havik
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, NO-7491, Trondheim, Norway
| | - Thomas Ihle Aarhus
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, NO-7491, Trondheim, Norway; Lead Discovery Center GmbH (LDC), Otto-Hahn-Strasse 15, 44227, Dortmund, Germany
| | - Iktedar Mahdi
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, NO-7491, Trondheim, Norway
| | - Anke Unger
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Strasse 15, 44227, Dortmund, Germany
| | - Peter Habenberger
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Strasse 15, 44227, Dortmund, Germany
| | - Carsten Degenhart
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Strasse 15, 44227, Dortmund, Germany
| | - Jan Eickhoff
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Strasse 15, 44227, Dortmund, Germany
| | - Bert M Klebl
- Lead Discovery Center GmbH (LDC), Otto-Hahn-Strasse 15, 44227, Dortmund, Germany
| | - Eirik Sundby
- Department of Material Science, Norwegian University of Science and Technology (NTNU), NO-7491, Trondheim, Norway
| | - Bård Helge Hoff
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, NO-7491, Trondheim, Norway.
| |
Collapse
|