Discovery of heterocyclic replacements for the coumarin core of anti-tubercular FadD32 inhibitors

  • Bioorg Med Chem Lett. 2018 Dec 1;28(22):3529-3533. doi: 10.1016/j.bmcl.2018.09.037.
Chao Fang  1 ,  Katie K Lee  2 ,  Raymond Nietupski  1 ,  Robert H Bates  3 ,  Raquel Fernandez-Menendez  3 ,  Eva Maria Lopez-Roman  3 ,  Laura Guijarro-Lopez  3 ,  Yunxing Yin  4 ,  Zuozhong Peng  5 ,  James E Gomez  2 ,  Stewart Fisher  1 ,  David Barros-Aguirre  3 ,  Brian K Hubbard  1 ,  Michael H Serrano-Wu  1 ,  Deborah T Hung  6
Affiliations
  • 1. The Broad Institute of MIT and Harvard, 415 Main St, Cambridge, MA 02142, USA.
  • 2. The Broad Institute of MIT and Harvard, 415 Main St, Cambridge, MA 02142, USA; Department of Molecular Biology and Center for Integrative and Computational Biology, Massachusetts General Hospital, 185 Cambridge St, Boston, MA 02114, USA.
  • 3. Diseases of the Developing World, GlaxoSmithKline, Severo Ochoa 2, Tres Cantos, 28760 Madrid, Spain.
  • 4. WuXi AppTec, 168 Nanhai Rd, Tianjin Economic-Technological Development Area (TEDA), Tianjin 300457, China.
  • 5. WuXi AppTec, 288 Fute Zhong Rd, Waigaoqiao Free Trade Zone, Shanghai 200131, China.
  • 6. The Broad Institute of MIT and Harvard, 415 Main St, Cambridge, MA 02142, USA; Department of Molecular Biology and Center for Integrative and Computational Biology, Massachusetts General Hospital, 185 Cambridge St, Boston, MA 02114, USA; Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA. Electronic address: [email protected].
PMID: 30316633 DOI: 10.1016/j.bmcl.2018.09.037
Abstract

Previous work established a coumarin scaffold as a starting point for inhibition of Mycobacterium tuberculosis (Mtb) FadD32 enzymatic activity. After further profiling of the coumarin inhibitor 4 revealed chemical instability, we discovered that a quinoline ring circumvented this instability and had the advantage of offering additional substitution vectors to further optimize. Ensuing SAR studies gave rise to quinoline-2-carboxamides with potent anti-tubercular activity. Further optimization of ADME/PK properties culminated in 21b that exhibited compelling in vivo efficacy in a mouse model of Mtb Infection.

Keywords
FadD32 inhibitor; In vivo efficacy; Mycobacterium tuberculosis; Quinoline-2-carboxamide; Structure-activity relationship.
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