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Publication Abstract from PubMed

Two novel compounds, pyridopyrimidines (1) and naphthyridines (2) were identified as potent inhibitors of bacterial NAD(+)-dependent DNA ligase (Lig) A in a fragment screening. SAR was guided by molecular modeling and X-ray crystallography. It was observed that the diaminonitrile pharmacophore made a key interaction with the ligase enzyme, specifically residues Glu114, Lys291, and Leu117. Synthetic challenges limited opportunities for diversification of the naphthyridine core, therefore most of the SAR was focused on a pyridopyrimidine scaffold. The initial diversification at R(1) improved both enzyme and cell potency. Further SAR developed at the R(2) position using the Negishi cross-coupling reaction provided several compounds, among these compounds 22g showed good enzyme potency and cellular potency.

Negishi cross-coupling enabled synthesis of novel NAD(+)-dependent DNA ligase inhibitors and SAR development.,Murphy-Benenato KE, Gingipalli L, Boriack-Sjodin PA, Martinez-Botella G, Carcanague D, Eyermann CJ, Gowravaram M, Harang J, Hale MR, Ioannidis G, Jahic H, Johnstone M, Kutschke A, Laganas VA, Loch JT 3rd, Miller MD, Oguto H, Patel SJ Bioorg Med Chem Lett. 2015 Nov 15;25(22):5172-7. doi: 10.1016/j.bmcl.2015.09.075., Epub 2015 Oct 14. PMID:26463129^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.