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Farrell KD, Gao Y, Hughes DA, Henches R, Tu Z, Perkins MV, Zhang T, Francis CL. 3-Methoxy-2-phenylimidazo[1,2-b]pyridazines highly active against Mycobacterium tuberculosis and Mycobacterium marinum. Eur J Med Chem 2023; 259:115637. [PMID: 37524009 DOI: 10.1016/j.ejmech.2023.115637] [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: 05/26/2023] [Revised: 07/09/2023] [Accepted: 07/11/2023] [Indexed: 08/02/2023]
Abstract
A series of 3-methoxy-2-phenylimidazo[1,2-b]pyridazine derivatives which were highly active against autoluminescent Mycobacterium tuberculosis (Mtb) and Mycobacterium marinum (Mm) in an in vitro assay were identified. SAR analysis showed that the most active compounds, which included a phenyl group bearing fluoro substituent(s) at C2, a methoxy function at C3, and a benzyl-heteroatom moiety at C6, exhibited in vitro MIC90 values generally around 0.63-1.26 μM against Mtb and Mm. However, these compounds were inactive against Mtb in vivo (mice), and investigations revealed very short metabolic half-lives (<10 min) when incubated with mouse liver microsomes. Multiple observations of side products produced from oxidative cleavage of the imidazole moiety during the chemical synthesis work suggested that this is a likely metabolic pathway leading to the lack of observed activity in vivo.
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Affiliation(s)
- Kyle D Farrell
- College of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia
| | - Yamin Gao
- State Key Laboratory of Respiratory Disease, Guangdong-Hong Kong-Macao Joint Laboratory of Respiratory Infectious Diseases, China-New Zealand Joint Laboratory on Biomedicine and Health, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, 510530, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Deborah A Hughes
- Drug Discovery Chemistry Team, CSIRO, Clayton, VIC, 3168, Australia
| | - Robin Henches
- Drug Discovery Chemistry Team, CSIRO, Clayton, VIC, 3168, Australia
| | - Zhengchao Tu
- Drug Discovery Pipeline & Guangdong Provincial Key Laboratory of Biocomputing, Guangzhou Institutes of Biomedicine and Health, Guangzhou, 510530, China
| | - Michael V Perkins
- College of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia
| | - Tianyu Zhang
- State Key Laboratory of Respiratory Disease, Guangdong-Hong Kong-Macao Joint Laboratory of Respiratory Infectious Diseases, China-New Zealand Joint Laboratory on Biomedicine and Health, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, 510530, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Craig L Francis
- Drug Discovery Chemistry Team, CSIRO, Clayton, VIC, 3168, Australia.
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Barlin GB. Imidazo[1,2-b]pyridazines: Syntheses and interaction with central and peripheral-type (mitochondrial) benzodiazepine receptors. J Heterocycl Chem 1998. [DOI: 10.1002/jhet.5570350515] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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