Lead optimization of a novel series of imidazo[1,2-a]pyridine amides leading to a clinical candidate (Q203) as a multi- and extensively-drug-resistant anti-tuberculosis agent.

Abstract

A critical unmet clinical need to combat the global tuberculosis epidemic is the development of potent agents capable of reducing the time of multi-drug-resistant (MDR) and extensively-drug-resistant (XDR) tuberculosis therapy. In this paper, we report on the optimization of imidazo[1,2-a]pyridine amide (IPA) lead compound 1, which led to the design and synthesis of Q203 (50). We found that the amide linker with IPA core is very important for activity against Mycobacterium tuberculosis H37Rv. Linearity and lipophilicity of the amine part in the IPA series play a critical role in improving in vitro and in vivo efficacy and pharmacokinetic profile. The optimized IPAs 49 and 50 showed not only excellent oral bioavailability (80.2% and 90.7%, respectively) with high exposure of the area under curve (AUC) but also displayed significant colony-forming unit (CFU) reduction (1.52 and 3.13 log10 reduction at 10 mg/kg dosing level, respectively) in mouse lung.

• Authors: Sunhee Kang, Ryang Yeo Kim, Min Jung Seo, Saeyeon Lee, Young Mi Kim, Mooyoung Seo, Jeong Jea Seo, Yoonae Ko, Inhee Choi, Jichan Jang, Jiyoun Nam, Seijin Park, Hwankyu Kang, Hyung Jun Kim, Jungjun Kim, Sujin Ahn, Kevin Pethe, Kiyean Nam, Zaesung No, Jaeseung Kim
• Journal: Journal of medicinal chemistry (J Med Chem) Vol. 57 Issue 12 Pg. 5293-305 (Jun 26 2014) ISSN: 1520-4804 [Electronic] United States
• PMID: 24870926 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antitubercular Agents
• Imidazoles
• Pyridines

Topics

• Animals
• Antitubercular Agents (chemical synthesis, chemistry, pharmacology)
• Drug Resistance, Multiple, Bacterial
• Humans
• Imidazoles (chemical synthesis, chemistry, pharmacology)
• Macrophages (drug effects, microbiology)
• Mice
• Microsomes, Liver (metabolism)
• Mycobacterium tuberculosis (drug effects)
• Pyridines (chemical synthesis, chemistry, pharmacology)
• Rats, Sprague-Dawley
• Structure-Activity Relationship
• Tuberculosis, Multidrug-Resistant (drug therapy)